The knee-up or knee-drive drill for long jumpers is designed to increase the strength and power of the hip flexors, a muscle group important for jumpers. Much like the C-curve drill, it's dubious whether or not this drill directly impacts the technique of a jumper, but this drill can be used as a conditioning exercise. Having an athlete perform a set of 5-10 repetitions per leg and then running a fast 150-m, for example, can be used to stimulate proper running technique. Pay particular attention to the arm-action, as this drill will frequently confuse athletes leading them to drive the wrong arm with a given lead leg.
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