Sick or Absent Swimming Instructor: How to Keep Lessons Running [2026]

A small swim school has no buffer. If one instructor is absent, an entire block of lessons for twenty or thirty children is immediately canceled. Those children have often waited months for their spot. Many swim schools operate with a waiting list, and the wait time often extends to several months. This makes every missed lesson more costly than the amount on the invoice.

Absences are not an exception. In many countries, the sickness absence rate is around 5 percent, and in a small team, every sick report feels especially impactful. That sounds reassuring until you calculate it for a team of three instructors and 260 working days per year: about seven working days per person. Usually, it’s a two-day cold. Occasionally, it’s a broken wrist or a sick parent at home, and then you spend weeks figuring things out.

What matters is whether something is ready when the phone rings.

Why Absences Hit Small Swim Schools So Hard

A Missed Lesson Affects Three Things at Once

The lesson itself is the least problem. Worse is what happens around it. Parents who have seen their child on a waiting list for months lose trust as lessons become irregular. Students who just mastered an exercise regress during weeks without water time. And you lose the hours needed to keep your groups on track.

That trust directly impacts your revenue: many providers notice that parents are more likely to reconsider continuing after a turbulent period.

What a Missed Day Costs You

Count the entire process. What a missed month costs depends on how long the course lasts.

With one 45-minute lesson per week, a child is in training for years, so a skipped month shifts the entire series. Refunding lesson fees is a direct cost, while a make-up session costs you only an hour of lesson time. Whoever sets this difference in advance doesn’t have to think about it on the day itself.

The Entire Industry Faces the Same Problem

Staff absences are not a local accident. Everywhere there is a shortage of staff, available lesson time, and swimming water. In the United Kingdom, Swim England calculated that about 667,000 children miss swim lessons due to a shortage of instructors. Wherever swimming lessons are under pressure, the same pattern emerges: too few people, too much demand, and little room to cover for a sick instructor.

Worldwide, according to the WHO, about 300,000 people drown annually, and for children aged 5 to 14, drowning is the third leading cause of injury-related death. Lessons that are canceled directly affect children’s safety worldwide.

Five Agreements to Have Ready Before You Need Them

1. Define Who May Substitute

In many countries, there is no legally required instructor diploma, and you set the standard yourself. Write down what a substitute must meet: a completed instructor training, a recent certificate of good conduct (or what is customary in your country), and experience with the levels currently in the water. Also specify who may not substitute, for example, an intern without supervision.

2. Build a Substitute Pool of Three or Four Names

One name is not a pool. That one colleague is exactly the person you call when they are on vacation. Think of a friendly nearby swim school with whom you can swap, a freelancer who works flexibly, a former instructor who wants a few hours per week, or an experienced swimmer with the right training. Make it a reciprocal agreement so you can also take over their groups. Record for each person how to reach them, how quickly they can come, and what rate you agree on.

3. Ensure a Substitute Can Get In

This is the agreement most often missing. Where are the keys, what code do you need for the staff entrance, where are the flotation devices, who is the lifeguard on duty, and when is the lane free for you? A substitute standing outside a closed door for twenty minutes calling is no solution. Put these practical agreements in one place, along with the pool’s house rules.

4. Keep a One-Page Handover

Which groups swim when, at what level, who is stuck on an exercise, and which student has a special note? Think of ear problems, fear of water, a disability, or medication. If that overview is in one place, a substitute can continue where you left off in five minutes. A substitute finds nothing in a notebook that’s in your bag.

In the Swimmigo app, this is available per student and per group: seven levels, 86 skills, and a score per exercise. A substitute immediately sees where a child stands and which exercise is next. More about this is on the page about the student tracking system.

5. Agree on What a Missed Lesson Yields

Choose one approach: refund, a make-up session, or pushing to the end of the course. Put this line in your terms and conditions so you don’t have to negotiate with each parent. Make-up sessions are usually easiest: you don’t lose revenue and the student doesn’t lose skills. Also specify whether a package continues during the instructor’s illness and whether a lesson you cancel yourself is always made up.

When It Happens: The First Two Hours

Decide in This Order

Work through a fixed list, because at the moment itself you tend to grab the first solution. Can you take the lesson yourself? Can a regular colleague shift their schedule? Is someone from your substitute pool available who meets your requirements? Can you merge two small groups without compromising safety? And if the answer is no four times: cancel the lesson and schedule a make-up session.

Write down this order and hang it where everyone can find it. Then you don’t have to recall it from memory when you’re already under pressure.

Where Safety Makes the Decision

Group size is not a detail you can stretch. Many providers work with groups of five to ten children, and the maximum group size depends on the pool, depth, and number of instructors supervising. Putting twenty children with one instructor in the water increases risk more than canceling a lesson. Better to cancel that one lesson.

The same applies to who is in the water. A substitute without the right training may observe once but not independently run a group with beginners.

One Message to All Parents

Decide in advance through which channels you reach parents, and stick to one message per event. Tell what happened, what will happen with the lesson, and what parents need to do. Put the same text in the app and on the pool door, so no second version circulates.

Expect that some parents speak a different language than you. Notifications in Swimmigo are stored with a translation key and only displayed in the recipient’s language, so the same message arrives in Dutch, English, German, French, or Spanish. Messages in the app have a read receipt so you know who has seen it.

Record the Lesson, Even if It Doesn’t Take Place

Mark the absence with a reason and link a make-up session. If you don’t do this, the information disappears and a parent asks three weeks later why their child still hasn’t progressed. Progress per student remains visible, so a missed week doesn’t have to be a gap in the overview.

The Following Week: Make Up, Update, Finish

Schedule Make-Up Sessions as Extra Spots

Don’t open an extra evening at the pool for two students. Put them in an existing group with space, or use a moment when you’re already in the water. In Swimmigo, you can create a make-up group with extra spots so a student can join without shifting your entire schedule.

What You Promise Parents and What You Record

Be clear about money. Does a monthly subscription continue during an absence week, or do you suspend it? Does a parent get a lesson back or a credit? Put that once on paper instead of promising something case by case that you can’t keep later. If you choose to refund, that’s a direct cost. If you choose a free lesson, it costs you an hour and keeps the student enrolled.

This covers the most common situations in the app:

Write Down Who Did What

Who took over the group, which student was moved, which lesson was rescheduled? Sounds like bureaucracy until you have a dispute with a parent or a new colleague hands over a group. An activity log of a few lines per week is enough. In Swimmigo, that log is automatically stored with the school, showing who changed what.

How to Keep It Sustainable Long-Term

Fill Your Schedule to About 90 Percent

A schedule filled to the last minute collapses at the first sick instructor. Leave room for a make-up lesson, an intake, or a conversation with a parent. That space feels like lost revenue on paper, but it’s exactly what keeps you afloat in a busy month. The same applies to groups: a group of ten that suddenly has eight children is easier to manage than a group always at maximum capacity.

Keep the Number of Changes Low

Children notice more than you think. If someone different leads the group every week, it costs time and trust. Rotate deliberately: let a substitute take over a group they already know, or have the same substitute for a longer period. More about what changes do to a child’s progress is in the article about changing swimming instructors.

Show a Substitute the History

The best substitute is the one who knows where a student stands within two minutes. That only works if the history is digitally recorded and not in one person’s head. How to set that up for parents and yourself is on the feature page, and the levels your child goes through are on the levels page.

Include the Costs of Absences

Absences are a business risk, not bad luck. Include it in your rate: the hours you must make up, the space you keep free, and the buffer for longer absences. Swimmigo starts with a free 30-day trial that begins once your first student is linked. After that, you choose the Solo subscription or the School subscription, with unlimited students and monthly cancellation.

What exactly is in which version is on the page for swimming instructors and swim schools.

In Short

An absent instructor is a normal business risk, and with a few agreements, the damage stays limited. Define who may substitute, keep a substitute pool of a few names handy, ensure someone can get in, and keep the lesson history digitally so a substitute can continue in five minutes. Communicate with one message in the parent’s language, and convert a missed lesson into a make-up session instead of a refund.

The swim school that manages this well loses a week. The swim school that doesn’t loses parents who have waited months on the waiting list.

Sources

• Swim England: Concerning number of children to miss swim lessons due to teacher shortages, April 16, 2024
• WHO: Drowning fact sheet, updated September 28, 2026