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A powerful simultaneous stroke that stresses the shoulders, lower back, and hips
Butterfly is one of the most physically demanding strokes in swimming. It combines powerful simultaneous arm recovery with continuous dolphin kick, placing high stress on the shoulders, spine, and hips. When fatigue sets in or technique breaks down, small inefficiencies can quickly turn into overuse injuries.
Below are some common injuries associated with butterfly swimming ↓
1. Shoulder Overuse (Rotator Cuff / Swimmer’s Shoulder)
1. Shoulder Overuse (Rotator Cuff / Swimmer’s Shoulder)
Butterfly requires both arms to recover and enter the water at the same time. This repeated overhead motion places constant load on the rotator cuff and surrounding tissues. When volume increases too quickly or mechanics slip, irritation can build until even basic arm movement becomes painful.
Common Signs
Common Signs
Pain lifting arms overhead.
Sharp discomfort during recovery/entry.
Weakness or heaviness in shoulders.
Pain that shows up during sprint fly.
Typical Triggers
Typical Triggers
Too much fly volume too soon.
Paddle work while fatigued.
Entering too wide or crossing inward.
Forcing recovery when shoulders are cooked.
Prevention Ideas
Prevention Ideas
Keep fly volume controlled (quality > quantity).
Emphasize relaxed recovery + clean entry.
Strength: rows, face pulls, lower trap work.
Warm-up shoulders before fly sets.
Tip: If fly starts feeling “heavy,” switch to drilling rather than muscling through.
2. Lower Back Strain
2. Lower Back Strain
A lower back strain in butterfly occurs when repeated dolphin kicks and strong undulation overload the lower back muscles. It’s often caused by excessive arching, especially when the core is fatigued. Pain usually shows up during or after practice and worsens with continued butterfly swimming.
Common Signs
Common Signs
Aching/tight lower back.
Pain after long kick sets or fly sets.
Stiffness getting out of the pool.
Typical Triggers
Typical Triggers
Over-kicking from the lower back.
Too much underwater dolphin volume.
Big undulation when tired.
Prevention Ideas
Prevention Ideas
Cue: ribcage down, core engaged.
Reduce long underwater sets when fatigued.
Core stability: dead bug, planks, anti-extension work.
Tip: A smaller kick with better timing is usually faster and safer.
3. Hip Flexor / Groin Irritation
3. Hip Flexor / Groin Irritation
Hip flexor / groin irritation in butterfly happens when the repeated wave motion places stress on tight or overworked hip flexors. Poor mobility or mistimed kick timing increases strain, leading to discomfort or pain during and after swimming.
Common Signs
Common Signs
Tight/pinch at front of hip.
Discomfort during kick.
Reduced kick power.
Typical Triggers
Typical Triggers
Limited hip mobility.
Overuse of underwater dolphin.
Poor timing between arms + kick.
Prevention Ideas
Prevention Ideas
Dynamic hip mobility pre-practice.
Strength glutes/posterior chain.
Don’t turn every underwater into max effort.
Tip: If hips feel “locked,” focus on rhythm drills, not intensity.
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