To prepare for a Water Safety Instructor course you need to demonstrate the major strokes correctly rather than quickly. Front crawl, back crawl, breaststroke, elementary backstroke, sidestroke and butterfly all appear. Slow, exaggerated form is the skill being assessed.
What swimming skills do I need for a WSI course?
WSI does not ask you to rescue anything. It asks you to swim in a way a beginner can copy,
which is a genuinely different demand and catches strong swimmers out.
Expect to demonstrate front crawl, back crawl, breaststroke, elementary backstroke, sidestroke and
butterfly. Elementary backstroke and sidestroke are the two most people have not touched since
childhood, and butterfly is the one that causes the most anxiety.
Why is swimming a stroke slowly harder than swimming it fast?
This is the single most useful thing to understand before enrolling. Racing a stroke hides
flaws: momentum carries you through a poor catch, and nobody sees the detail. Demonstrating a stroke
at half speed for a class exposes everything.
You have to hold a recognizable position long enough for a seven year old to see it, exaggerate the
part you want them to copy, and keep your head where they can hear you. Competitive swimmers often
need to actively unlearn racing habits to do this.
What should I practice before a WSI course, and in what order?
- Elementary backstroke and sidestroke first. These are the two most likely to be
rusty and the easiest to rebuild. Start here rather than with butterfly. - Butterfly next. It does not need to be fast or pretty over distance. It needs
to be recognizable and correct over a short demonstration. - Then slow every stroke down deliberately. Swim a length of front crawl at half
your normal speed with exaggerated form. It is harder than it sounds and it is exactly the
assessment. - Practice demonstrating on land. Instructors explain strokes on the deck
constantly. Being able to describe the arm path while doing it is part of the job.
The half nobody prepares for
WSI is not only a swim test. A substantial portion is teaching methodology: how skills are
sequenced, how to structure a lesson, how to assess a swimmer against a level, and how to correct
without overwhelming.
Candidates who arrive assuming it is a swimming course are frequently surprised by how much of it
is pedagogy. If you have never taught anything, that portion will be the harder half, and it is worth
knowing that going in rather than discovering it in session two.
The mindset that makes it easier
Stop thinking like a swimmer and start thinking like a teacher. The question is no longer
"can I do this?" but "can I show somebody else how, in a way they can copy while slightly nervous?"
The candidates who struggle are usually excellent swimmers who cannot slow down. The candidates
who do well are often decent swimmers who are patient and observant. If you fall into the second
group, do not let a competitive swimmer's speed put you off enrolling.
Key takeaways
- You must demonstrate front crawl, back crawl, breaststroke, elementary backstroke, sidestroke and butterfly.
- Slow is harder than fast. Racing hides flaws that a half speed demonstration exposes immediately.
- Elementary backstroke and sidestroke are usually the rustiest and the quickest to rebuild, so start there.
- Butterfly needs to be recognizable and correct over a short demonstration, not fast or sustained.
- A substantial portion of the course is teaching methodology rather than swimming, which surprises most candidates.
- Practice explaining a stroke out loud while demonstrating it, because instructors do this constantly.
- Competitive swimmers often have to unlearn racing habits; patient, observant swimmers frequently do better.Give yourself several weeks of regular pool sessions if any of the six strokes are rusty; fitness is rarely the limiting factor.
- Practice demonstrating a stroke on dry land as well, because instructors explain technique from the deck constantly.
- Resolve any personal nervousness about deep water first, since you will be managing anxious swimmers while demonstrating in it.
What to practice before the course
| Skill | Why it matters | Priority |
|---|---|---|
| Elementary backstroke | Often rusty, quick to rebuild | High |
| Sidestroke | Rarely practiced since childhood | High |
| Butterfly | Needs to be correct, not fast | High |
| Front and back crawl at half speed | Exposes flaws speed hides | High |
| Explaining a stroke out loud | Core teaching skill | Medium |
| Treading while talking | Used constantly when teaching | Medium |
Want to book a class?
Call (718) 954-5567. Lifeguard and instructor classes are held at 37 Mineola Ave, Roslyn, NY 11576.
Frequently asked questions
Do I need to swim butterfly well?
You need it recognizable and correct over a short demonstration, not fast or sustained. Most candidates worrying about butterfly are holding themselves to a competitive standard the course does not ask for.
How long should I train before enrolling?
Several weeks of regular sessions is realistic if any strokes are rusty. To prepare for a Water Safety Instructor course properly, the limiting factor is usually elementary backstroke and sidestroke rather than fitness.
Is there a written component?
Yes. A meaningful portion of the course is teaching methodology, lesson structure and assessment, with written work alongside it. It is not purely a pool course.
Do I need lifeguard certification first?
No. WSI is standalone. Holding both is common and useful, but neither is a prerequisite for the other.
What if I have never taught anyone anything?
That is normal and the course teaches it. Teaching methodology is a taught skill rather than a personality trait, and most new instructors find their first real class harder than the certification.
Can I take the course if I am nervous about deep water?
That is worth resolving first. You will be demonstrating in deep water and managing swimmers who are themselves nervous, which is difficult if you are managing your own anxiety at the same time.
