Why ten minutes of warm-up is not optional
Swimming asks your shoulders to move through a bigger range of motion under load than almost any other activity, in a medium that removes the feedback your joints normally get from gravity. Cold muscles, a cold pool, and a first length swum at full effort is the standard recipe for a shoulder that hurts for three weeks.
Warm water helps, but most pools sit at 26–28 °C, which is below skin temperature. Your body's first response to immersion is to constrict peripheral blood vessels — the opposite of what you want before hard work. A proper warm-up raises muscle temperature, lubricates the shoulder joint with synovial fluid, and rehearses the movement pattern before you load it.
This routine takes ten minutes on the pool deck plus 400 m in the water. It is aimed specifically at swimmers, not at general fitness.
1. Arm circles and band pull-aparts (2 minutes, dry)
How: 15 large forward circles, 15 backward, at a controlled speed — not a windmill. Then, with a light resistance band held at shoulder height, do 15 pull-aparts: arms straight, pull the band apart until it touches your chest, squeeze your shoulder blades together, return slowly.
Why: Circles move the shoulder through its full available range and pump fluid through the joint. Pull-aparts wake up the rear deltoids and the muscles that hold the shoulder blade in a good position — the ones that are asleep after a day at a desk and that let the shoulder drift forward on every pull.
Common mistake: using a heavy band and shrugging. Light band, slow tempo, shoulder blades down and back.
2. Leg swings and bodyweight squats (2 minutes, dry)
How: 10 forward leg swings and 10 sideways swings per leg, holding a wall for balance. Then 15 bodyweight squats with your heels down and your chest up, going as deep as comfortable.
Why: Your kick starts at the hip, and breaststroke and butterfly both demand a deep, fast hip flexion that most people never practise. Swings open the hip capsule; squats prime the quads and glutes that drive every kick. For breaststroke swimmers this is the single most valuable dry-land item on the list.
Common mistake: swinging hard and bouncing at the end of the range. Keep it smooth and stop short of pain.
3. Thoracic rotation and a gentle neck series (1 minute, dry)
How: Standing tall, hands behind your head, rotate your upper body 10 times each way, keeping your hips facing forward. Then 5 slow head turns each way and 5 ear-to-shoulder tilts.
Why: Freestyle is a rotation sport. If your thoracic spine doesn't rotate, your lower back and neck make up the difference, and that is where the post-swim ache comes from. Rotary mobility here directly improves how easily you get to the breath without lifting your head.
Common mistake: rotating from the lower back. Put a hand on your sternum and think about turning the ribcage.
4. Easy 200 m swim plus 100 m kick (4 minutes, water)
How: 200 m easy freestyle at a pace you could hold for 1,000 m, then 100 m kick with a board at a relaxed tempo. Rest 20 seconds between.
Why: This is where the warm-up actually happens. The first 200 m raises core temperature and rehearses your stroke at low intensity, so your first hard repeat isn't your first stroke of the day. The kick set specifically prepares the ankles and knees for the loads of the main set, and it lets you feel whether your hips are high.
Common mistake: swimming the warm-up too fast. If you are breathing hard at the 200 m mark, you have already spent the energy you needed for the main set.
5. Four build 25s with full recovery (2 minutes, water)
How: 4 × 25 m, each one building from easy to about 85% effort over the length, with 20–30 seconds rest. The fourth should be your fastest, and it should still look like your stroke.
Why: This is the bridge between warm-up and work. It progressively raises heart rate and neuromuscular recruitment without accumulating fatigue, and it gives you feedback: if the fourth 25 feels terrible and your stroke has fallen apart, you need another easy 100 m before the main set, not more coffee.
Common mistake: sprinting all four. The point is the ramp, not the speed.
The whole routine at a glance
| Order | Item | Time | Where |
|---|---|---|---|
| 1 | Arm circles + band pull-aparts | 2 min | Deck |
| 2 | Leg swings + squats | 2 min | Deck |
| 3 | Thoracic rotation + neck | 1 min | Deck |
| 4 | 200 m easy + 100 m kick | 4 min | Water |
| 5 | 4 × 25 m build | 2 min | Water |
What not to do before you swim
Long static stretches — the kind where you hold a hamstring stretch for 60 seconds — temporarily reduce power output and do nothing for injury risk before activity. Save them for after the session, when they are genuinely useful. A short dynamic routine beats a long passive one every time.
Also skip the "warm up by swimming one fast 50" habit. It feels efficient and it means your first hard effort happens with cold shoulders, which is exactly the situation the warm-up exists to prevent.
If you only have five minutes
Do items 1 and 5. Band pull-aparts plus four build 25s covers the two things that matter most: shoulder preparation and a progressive rise in intensity. It is not ideal, but it is far better than diving straight into a main set.
Once you are warm, the quality of the main set is what drives progress — and that means knowing what pace you are actually holding. The pace guide gives you target times by level, and you can log each session's splits to see whether your warm-up pace is creeping up over the weeks. If soreness after swimming is a recurring issue rather than an occasional one, read muscle soreness after swimming before you add more volume.