1. TRAINING ERRORS

  A. Excessive mileage (over training)
  B. Inappropriate progression of training (intensity / duration) "Too much,       too soon" theory
  C. Poor running surface

2. INDIVIDUAL'S RUNNING STYLE (i.e. over pronation)

Normal pronation is when the heel lands on the outside, the foot rolls until the heel is aligned under your lower leg. Then the foot becomes rigid and propels you forward

Overpronation is when the foot rolls in too far after it hits the ground or before it prepares for the push-off.

Underpronation (or supination) is when the foot rolls to the outside after hitting the ground. Only 10% of the population are underpronators. This type of foot doesn't absorb shocks really well.

3. POOR EQUIPMENT (i.e. running shoes)

4. BODY TYPE, ALIGNMENT AND STRUCTURES

  A. Flat feet
  B. Hyper extended knees
  C. Decreased flexibility
  D. Overweight

5. MUSCLE IMBALANCE (Strength & Flexibility)