By leaning slightly forward at the hips (arrows A and B), runners use their upper hamstrings (C and D) to absorb force that would normally be absorbed by the knee. Some great research proves that the world’s best runners make initial ground contact with their upper bodies tilted slightly forward, while less efficient runners contact the ground with their spines almost vertical.
Making a few small changes in the way you run can make you faster, more efficient and possibly less injury-prone. But how do you know which
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