Start with the class record, not the energy
Open your notes app or the back of the class booking sheet and write down three things that actually happened. A track order. A cue she repeats. A week when something went wrong and she handled it in a particular way. Praise that could be pasted under any instructor's name gets a polite smile and a place in a drawer, while a single dated detail gets kept.
I learned this the unflattering way. In April 2025 I handed Jessamine, who teaches the Tuesday class at a community hall in Brackley, a card I had written in the car park. It said she had great energy and was an inspiration, and I had underlined inspiration, as if underlining could do the work of a detail. She read it by the hall door, thanked me warmly, and said, 'Tell your mum I asked after her.' My mum had come to exactly one class, in March. Her hearing aid had whistled every time the volume rose, and Jessamine had moved her to the side away from the speaker, turned the music down a notch without mentioning why, and faced her for every cue change after that, so she could read the instructions off her face. None of that was in my card. The card I should have written was about a woman who noticed a whistling hearing aid in a loud room and solved it in about ten seconds, in front of thirty people, without making my mum into an announcement.
So start there. Pick the moment, name it in one sentence, and let the thanks attach to it. If you cannot find a moment, attend one more class with the card in mind and watch what she does for latecomers, for the person on the chair, for the room when the hall is too hot. Instructors reveal themselves in the adjustments.
Dear Jessamine, Thank you for the Tuesday in March when my mum came to class and her hearing aid whistled against the speaker. You moved her to the quieter side, turned the volume down a notch and faced her for every cue after that, and you never once explained her to the room. She still talks about that class. So do I. With thanks, and see you Tuesday.
That card has a month, a place in the room and a decision she made, and it thanks her for the decision rather than a personality trait. Use the same shape and change every particular.
Handed over after the last class, or sent later
Timing changes what a line can say. A card handed over in the hall has to be short enough to read standing up, with somebody waiting to ask about parking. Keep the hall version to the moment and one sentence of thanks. A card sent later can carry the longer version: what the class did for your Tuesdays, the week you nearly stopped coming, the thing you only understood afterwards. Later cards also reach instructors who have left, which a hall card cannot do.
There is a third timing people forget, which is before an ending is final. If the timetable shows a new name from next month, write now, while she is still teaching the slot. A card that arrives after the last class has to travel through a reception desk, a manager and a pigeonhole, and some never arrive.
- Tonight is the right night to say this plainly: thank you for a term of Tuesdays where I arrived tired and left lighter, every single week.
- I am writing a week late on purpose, because I wanted to say that the last class has stayed with me, especially the quiet track at the end.
- This should have been handed over in the hall, so forgive the post: thank you for the Saturday you stayed behind to show me the turn again.
- Before the timetable changes and someone else takes this slot, thank you for a year of classes I planned my Thursdays around.
- No occasion, no ending, just this: thank you for last week, when the room was small and hot and you still made space for everybody in it.
Whichever timing you choose, sign it with your name and your class, in that order. Instructors teach several rooms a week, and 'the Wednesday six o'clock, back row by the fire exit' identifies you faster than a surname she has only seen on a booking system.
For a regular instructor you have had for months
A regular instructor has a record with you, and the card should read like one. Go back over the term: the routine she re-taught until the room had it, the week she changed your class when your shifts changed, the absence she noticed quietly, the track she brought back because the room asked for it.
Write these lines a little longer than the others on this page. A regular has earned more than a slogan.
- Thank you for greeting the room by name at the door, then starting promptly, so a class that begins at six really begins at six.
- You plan the hard track third, while we still have legs for it, and the song we sing along to fourth. That order has carried me through more bad weeks than I can count. Thank you.
- Thank you for re-teaching the bridge step facing us, slowly, on the left side as well as the right, until the whole room stopped guessing.
- When my work shifts changed, you told me the Wednesday class covers the same routines and wrote the time on my card. I did not miss a month. Thank you.
- Thank you for noticing absences without turning them into announcements. A quiet word at the door brought me back after my time away, and I have not forgotten it.
- You end with a stretch for the calves and the hip flexors, in that order, and you count it down honestly. My stairs at home thank you every week.
- Thank you for keeping one older routine in the set each month, so the long-standing members get a week where our bodies remember before our brains do.
- For two winters of dark evenings, a cold car park and a warm hall, and for never once cancelling at short notice: thank you.
Leave out the results. A list of measurements turns a thank-you into a progress report she is then expected to applaud. Thank her for the teaching.
For a cover instructor, or a class you took once
Cover instructors get almost no cards, which is why a short one works so well. She taught a room quietly loyal to somebody else, and she will be gone before anyone learns her surname. Your line needs one thing she did in that single hour, named accurately, handed over that night, because there is no later for a cover teacher.
Keep the comparison out of it. Telling a cover instructor she was nearly as good as your usual teacher is a review wearing a card's clothing, and she will hear the nearly. Thank her for her own class. If she kept your regular instructor's routines and said so honestly, that honesty is worth naming, since plenty of cover teachers pretend the set was theirs.
- You covered one evening, learned the names on the booking sheet before the warm up, and taught the room like it was yours to look after. Thank you.
- Thank you for saying at the start which routines were hers and which one was yours. That honesty settled a room that arrives suspicious of substitutes.
- I came as a visitor while away from home, and you placed me where I could see your feet and the door. One class was enough to feel looked after. Thank you.
- Thank you for the cover class in the smaller room, where you turned us to face the long wall and the whole routine suddenly had room to breathe.
- You will probably not teach us again, so this is short and meant: the extra water break on the hottest night of the year was exactly right. Thank you.
- Thank you for leaving the hall list on the speaker for our usual instructor, with the new track we asked for written at the top of it.
If you do not know her name, write the card to the class and the date instead, and leave it with the desk staff with the day and time written on the envelope. 'For the instructor who taught Tuesday at six, 14 October' reaches the right person in most centres. A card addressed to nobody in particular, left on a speaker, usually reaches the cleaner.
For a beginner writing from the back row
Beginners often write apologetic cards, full of sorry for being slow and thanks for putting up with them. Cut the apology. You paid for the class, you turned up, and your instructor's job includes the back row, so thank her for how she did that part of the job rather than for tolerating you. The useful beginner details are very specific: where you stand, who you follow, how she signals that a step is coming back, whether she corrects people in public or inside the routine where only the person concerned notices.
One more thing worth saying in a beginner card is that you stayed. Instructors lose most new people early and rarely learn why, and the habit that kept you there is information she can use for the next nervous person behind the bags.
- I have spent four months in the back row learning by following shoulders. Thank you for never moving me forward before I asked to go.
- Thank you for the instruction to pick one person who looks certain and follow them for a whole track. It got me through my first month.
- You say a step will return in the chorus, and then you wait until it does before adding anything new. A beginner can build on that. Thank you.
- Thank you for not correcting my arms in front of the room. You showed the smaller arm movement beside me, inside the routine, and let me copy it quietly.
- This is my first exercise class since school, so this line carries some weight: I stayed because nobody laughed when I turned the wrong way.
- Thank you for counting the last eight aloud when the music gets loud. Hearing the end coming is what keeps a new person dancing instead of drifting to the bags.
- To the instructor who made a room of strangers feel ordinary to join: thank you. Ordinary is underrated, and it is why I renewed.
Do not turn the card into a pledge to attend forever. A card with no pledge in it is easier to believe.
For the low-impact, chair and online versions of the class
These are three different classes wearing one name, and the card should say which one you attend. The chair version is not a lesser class, and an instructor who builds the seated routine into the track from the start, rather than inventing it when somebody arrives on a chair, has done design work that deserves naming. The same goes for the low-impact version of a jump: if she shows the replacement step in the same breath and at the same volume as the jump, nobody in the room has to ask for the smaller option out loud.
Online classes need a different detail again: describing cues out loud for the person following by sound, checking the chat between tracks, noticing a new background. 'The online classes were great' tells her none of that effort landed.
- Thank you for building the seated version into the routine from the start, so the people on chairs are dancing the same track at the same time.
- When my knee flared in January, you gave me a marching version with the turns taken out and the arms left in. I kept my class and my dignity. Thank you.
- Thank you for describing every cue out loud in the online class, so a person working from sound alone in a kitchen can follow the changes.
- You check the chat box between tracks and answer the question about the step while the next song loads. Online classes can feel lonely. Yours does not. Thank you.
- Thank you for the low-impact week after the charity event, when half the room was sore and you rebuilt the set around what our bodies had left.
- For showing the jump, then immediately showing the step that replaces it, in the same breath and at the same volume: thank you.
If you attend online, give her the geography instead: your town, your kitchen, the hour her class occupies in your house. That is the equivalent of naming your row.
A whole-class card, organised without a phone tree
Group cards fail in a predictable way. Somebody starts a chat thread, twenty people reply with thumbs up, nobody writes anything, and the last class arrives with a card containing three signatures and a lot of blank space. Do it the other way round. Buy the card yourself, write your own line first, then carry it to two classes in a row and stand by the door with a pen. People sign cards that are in front of them.
Keep the group lines short and let each person add one particular of their own rather than signing under a single printed sentiment. If the class wants to give money as well, collect it separately and put it in its own envelope with the amount and the givers written on the back, so the card stays a card and nobody has to read their thanks through a banknote. A group card with multiple signers solves the same problem when the class is scattered across two venues or an online group, and each person still writes their own line.
- Back row, by the fire exit, grateful since September.
- From the Wednesday regulars who share lifts, water and the good spot by the fan.
- One term, eleven tracks, zero weeks I regret showing up for. Thank you from all of us.
- You taught the routine, then you taught us the routine again for the people who missed a week. Both halves of this card noticed.
- Signed by the class that arrives early to help move the tables, because you always help move them back.
- Our names are below in the order we stand in the room, which you will recognise faster than you read them.
Leave two blank spaces at the end. Somebody always misses the signing class, and a late name added in a different pen reads as effort, which it is.
What belongs in the card, the review and the tip envelope
Three different documents get mixed up in one envelope. The card is for the moment and the relationship: the track, the cue, the week she noticed you were missing. The review is for strangers deciding whether to book, so it belongs on the centre page, should name the class, day and level honestly, and should use the plain language you would want to read before paying. Praise that only makes sense inside the room is wasted in a review.
Money is the third document. If your class collects for an instructor, or you want to give a tip or a voucher yourself, put it in a separate small envelope with your name on it and hand it over with the card, not inside it. Cards get propped on speakers, passed round and read aloud. Cash tucked into a card gets lost, or worse, it makes the thanks look priced. It also embarrasses an instructor who works for a centre with a policy on gifts, and a separate envelope lets her deal with the two things separately. The same split applies to a social media post: tag her if she uses a public teaching account and keeps the class business there, and keep anything about your health, your body or your family out of the post and in the card, where she is the only reader. A fuller rundown of the wider etiquette sits in what to write in a thank you card, and the employee recognition ideas that actually work piece is worth reading if you are organising thanks for a whole leisure centre team rather than one instructor.
On names: if you only know her first name, use it, and add the class underneath your signature. If you are unsure of the spelling, check the timetable rather than guessing on the envelope. She will notice a wrong spelling every time she looks at the card.
Lines to leave out, and what to write instead
Four kinds of line show up in instructor cards constantly and do no work at all. The first praises a personality instead of an act, so it could be signed by anyone. The second reviews her body or yours, which is not thanks in either direction. The third apologises for existing in the room. The fourth promises a transformation, which turns the card into an advert for the class and puts her in the position of having to agree with your assessment of yourself.
Thank you for the energy, you are an inspiration to us all.
Best instructor ever, the classes are amazing and so much fun.
Thank you for helping me lose the weight and get my old body back.
Sorry I am always at the back being hopeless, please ignore me.
Each of those has a usable version one detail away. Energy becomes the week she re-taught a routine at half speed four times running because three new people had arrived together, or the morning she rebuilt the set for a sore room. Amazing becomes the track order, the re-taught bridge, the stretch she refuses to cut. The weight line becomes a line about what you can now do in ordinary life, such as the stairs, the shopping or the walk to the hall, said as a fact about your week rather than a verdict on your body. And the apology becomes a straightforward thanks for the back row being treated as part of the class, which is what you actually meant.
Also leave out comparisons with other instructors. And if you have a complaint about heating, booking or the changing rooms, write that separately to the centre. A complaint inside a thank-you card contaminates both messages, and the instructor is rarely the person who can fix the boiler.
Turn it into a group card
Zumba classes are already groups, which makes them the easiest classes in the building to thank properly and the easiest to thank lazily. A single card passed round the changing room collects names. A group card collects the room itself: the back row, the chair dancers, the online regulars, the woman who arrives early to move the tables, each with one line about the class as they actually experience it. Read together, those lines tell an instructor what her class is, which no single writer can do.
A thank you ecard or a shared board makes that practical when the class is split between two halls or half of it attends online. One link goes to everyone, each person writes their own line in their own time, and nobody has to stand by a door with a pen for two weeks. You can create a card online in a couple of minutes and send the link in the class chat. For more on how groups actually pull this off, the power of group greeting cards piece covers the organising habits that stop a group card stalling at three signatures.
On the drive home from Brackley on Tuesdays I pass a man walking a ferret on a lead along the verge by the old railway bridge. The ferret wears a red harness and walks in short bursts, then stops and sits down in the grass as if the walk was its idea to end. I have seen them perhaps a dozen times and I still do not know whether the ferret has a name, or whether it walks on any other evening, or where they turn round and go back.