Knowing how to warm up before swimming helps you swim more comfortably from the first length, reduces the risk of strains and cramps, and eases your body into the water instead of shocking it with a cold sprint. It doesn’t need to be long or complicated — a few minutes of gentle movement does the job. Here’s a simple routine.

The short answer

To warm up before swimming, do a few minutes of gentle dryland movement — arm circles, shoulder rolls, and leg swings to loosen your joints — then get in and start your swim easy: a few relaxed lengths, gradually building effort, before any harder swimming. Favor moving (dynamic) stretches over long static holds on cold muscles. The whole warm-up can take five to ten minutes and makes everything that follows feel better.

Why warm up

  • Fewer strains and cramps. Easing in prepares your muscles and joints, lowering the chance of a pulled muscle or a sudden cramp.
  • You swim better. Warm, loose muscles and a raised heart rate mean smoother strokes and less of that awful “first length feels terrible” struggle.
  • A gentler start for your body. Cold water plus a hard, cold-start effort is a shock. Easing in is kinder and safer.
  • A mental ease-in. For nervous swimmers, a gentle start helps you settle and relax before you focus on technique.

Step 1: A few minutes of dryland movement

Before you get in, loosen up on the pool deck with gentle, moving stretches (not long static holds):

  • Arm circles — forward and backward, small then bigger, to loosen your shoulders (your main swimming joint).
  • Shoulder rolls and gentle arm swings across your body.
  • Leg swings — front-to-back and side-to-side, holding a wall for balance.
  • Gentle torso twists and neck rolls.

Keep it easy and controlled — you’re waking your body up, not working out.

Step 2: An easy in-water warm-up

Now ease into the water and start gently:

  • Swim a few relaxed, easy lengths at a slow, comfortable pace — this is not the time to push.
  • Gradually build your effort over several lengths as your body warms.
  • Mix in some easy kicking (with or without a board) and gentle strokes to loosen everything.
  • Only after you feel warm and moving well should you start any harder or faster swimming.

This gentle build is exactly how a good lap workout starts, too.

A simple five-minute warm-up to copy

If you’d rather not think about it, here’s a routine you can use exactly as written:

  1. Arm circles — 20 seconds forward, 20 seconds backward.
  2. Leg swings — 10 each leg, front-to-back, holding a wall.
  3. Shoulder rolls and torso twists — 30 seconds, loose and easy.
  4. Get in and swim 2–3 easy lengths at a relaxed, slow pace.
  5. Add a little easy kicking — half a length or so, gentle.
  6. Build to a comfortable steady pace over the next couple of lengths.

That’s it — under ten minutes, and your first “real” length will feel far smoother than a cold start.

Warming up in cold water

If you’re swimming somewhere cold — an unheated pool, a lake, or the sea — the warm-up matters even more, and it changes shape a little. Get your breathing under control before you do anything else. Cold water triggers a gasp reflex and fast, shallow breathing, so wade or lower in slowly, splash a little water on your face and neck, and take slow, deliberate breaths until they settle. Only start swimming once your breathing feels calm and normal. Do a bit more dryland movement on the bank first, since your muscles cool faster in cold conditions, and keep your opening lengths especially gentle. Never dive or jump straight into cold water from a cold start — ease in.

A note on static stretching

The old habit of deep static stretches (holding a stretch for 20–30 seconds) on cold muscles isn’t ideal before exercise. Save those longer holds for after your swim, when your muscles are warm — that’s when they’re most useful and safest. Before swimming, keep it moving and gentle.

Don’t forget fuel and hydration

A warm-up works best on a body that’s fueled and hydrated. If you’re swimming a longer or harder session, a light snack beforehand and some water help — see what to eat before swimming. Showing up under-fueled or dehydrated is a common reason people feel tired fast.

Stay safe

  • Warm up and swim in water suited to your ability, with a lifeguard present. Never alone.
  • Ease off if anything feels sharp or painful — a warm-up should feel good, not strained.

The next small step

Next swim, build in a simple five-minute warm-up: a couple of minutes of arm circles and leg swings on deck, then a few easy lengths before you get into the main part of your session. You’ll notice the difference immediately — smoother strokes, fewer twinges, and a much nicer first few lengths.