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[mighty]

@James_Smith

We know that the primary function of the hamstring during ground based locomotion is to extend the hip. Placing substantial load on it as a flexor of the knee, in my view, places a non-complimentary stress on it that when combined with the stress of high speed locomotion increases the likelihood of pulls.

This is the theory that makes sense in my system and I have a fantastic track record of hamstring health with my players during the times of year in which I have autonomous control over the entire training load.

It is not my intent to discourage others from performing GHR and hamstrig curls. To each his own.

Agreed. Considering again that hamstring pulls are multifaceted I thought I would make some points worth noting.

1. It is now generally accepted that the biceps femoris acts more as a knee flexor and external rotator of the tibia.
2. Biceps femoris is the most commonly torn of the three hamstrings.
3. Deceleration of the lower limb during sprinting once the femur as reached peak hip flexion is a common source of hamstring pulls.

I believe the GHR assists in preventing hamstring pulls in these specific circumstances. But of course, progressive practice of maximal effort sprinting is king in preventing hamstring pulls during sprinting activities. As someone mentioned earlier, we have coaches trying to find gym exercises that do this and that, but without any actual full recovery sprinting within the program.