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I received a question in response to one of my more recent youtube videos on drop jumps from sakarumaster. The questioner wanted to know about the degree of knee bend required and triple extension. Here's the question and my answer and do also check out the video.
Q: Hi I was just wondering when we do the drop jumps, should we extend our legs fully and go into triple extension (hips ankles and knees unlocked) after we land or should be just bounce up keeping the same knee and hip angle while reacting?
A: That's a good question... we tend to use drop jumps for developing leg stiffness thus keeping the knee angle minimal with slightly reduced triple extension (this does create a bit of a bounce as you note, which in many ways is the aim... i.e. so that the muscles, ligaments and tendon will react/fire powerful on, e.g. striking the board for a long jump take-off). Potentially an athlete will dwell a little more on the ground if they "set" to triple extend. Also we believe in stiff ankles at contact and then pulling the ankle up after contact too, to create greater stiffness. The other plyometrics exercise we use, bounds and hops, for example, will employ greater triple extension due to the requirements of the movement/movements. We use the stiff type drop jumps (and partial hops) in the belief that it will create that greater stiffness and reactivity for the hops, bounds, long jump take-off and sprinting. Depending on your event and your level of training I'd actually vary the emphasis of the drop jumps you perform, so some with less triple extension than other, but you must channel that plyometric ability (stiffness/power) into your other ploys as required for your event. I think I have said in another video that a mature long jumper, for example, does not need to do the same plyos as a triple jumper. Try to work against the needs of the event, the stage in your development and your needs. Hope that helps