ARE NORDICS HAMSTRING CURLS RUINING YOUR RUNNING? Most people think that the hamstrings have a large eccentric action during sprinting where the fibres need to actively lengthen at the end of swing to decelerate the leg. But what if I told you this is probably not the case? That the lengthening comes from passive structures in the muscle and that the hamstrings work predominantly isometrically before ground contact? What if doing Nordics and knee curls are making things worse by adding too much bulk, increasing muscle slack and slowing you down? Would you then condition them differently? Hooren & Bosch (2016) suggests we should! After applying this principle with my own patients, I’ve found insane carry over into reducing pain, improving performance and saving people time in the gym. Here are a few groups of exercises you can start using instead to train your hamstrings the way they’re supposed to. 1. ROMAN CHAIR VARIATIONS Build massive isometric strength in the hamstrings usi...