Limited hip and pelvis movement due to SMA increases the likelihood of developing iliotibial band syndrome, back pain, hip joint pain and hamstring strains. The pelvis is supposed to move gently – up, down, forward and back – to aid the swinging action of the legs while running (or walking).
When the center of the body is tense and the hip joints don’t move, the action of walking or running will come solely from the hip joints, which puts tremendous strain on the joints and can create overuse injuries of the hips and hamstrings.
You will run with your hip joints instead of allowing the movement, free and fluid, to come from the whole body.