Common Causes of Exercise Injuries: What to Avoid (and What's Not a Cause)

Contrary to popular belief, poor flexibility is not a primary cause of exercise-related injuries. Research shows limited evidence linking pre-exercise stretching to injury prevention.

Evidence-Based Common Causes

1. Training Load Errors: Rapid increases in volume, intensity, or frequency (>10% per week) — "too much, too soon."
2. Inadequate Recovery: Insufficient sleep, nutrition, rest days; cumulative fatigue.
3. Poor Movement Mechanics / Technique: Faulty biomechanics under load (e.g., knee valgus in squats, rounded back in deadlifts).
4. Muscle Weakness or Imbalances: e.g., weak glutes → knee/low back overload; weak rotator cuff → shoulder impingement.
5. Insufficient Warm-Up: Failing to prepare tissues and nervous system for demand.
6. Previous Injury (Unrehabilitated): The strongest predictor of future injury.
7. Fatigue: Acute (within session) or chronic (overreaching) impairs control.
8. Environmental Factors: Slippery surfaces, extreme heat/cold, poor equipment.

What About Stretching?

• Static stretching before exercise may transiently reduce strength/power.
• Dynamic warm-up (movement prep) is preferred pre-workout.
• Static stretching post-workout or in dedicated sessions improves long-term range of motion but doesn't prevent acute injury.

Injury Prevention Framework

• Progressive overload with periodization.
• Strength training 2–3×/week (focus on weak links).
• Prioritize sleep (7–9 hrs) and protein intake.
• Master technique before adding load.
• Listen to pain signals (sharp, joint pain ≠ muscle burn).

Flexibility is a component of mobility, but load management and strength are the primary injury determinants.