Agree with running style. I was a heel striker for 95% of my running career. Then I had hip discomfort bad enough to force me to change to a mid-forefoot striker. I have either bursitis, a damaged labrum, or both. Heel striking means all impact goes straight into the hip joint, and is not absorbed by quad, hamstring and calf action.
The style change made a big improvement in speed/efficiency and comfort. But the damage was done to my hips after 20 years of poor form. I stopped running and switched to biking, hiking and swimming.
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