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Anonymous
Hey /fit/,
I've been reading into the physics of plyometrics to better understand them and to improve my gains from training with them. Apparently, depth jumps work on the premise of loading your muscles with incredible force (say you weigh 100kg and jump from 1m, then the force = 100kg x 19.8m/s/s = your muscles temporarily contracting with 1980kg of force) and making them accustomed to producing so much strength in so little time. This momentary contraction is called a "shock."

Lately, I've also noticed that by jumping up into the air and then driving my feet HARD back down into the ground, I literally feel something like a shock (I'm guessing muscle contraction, but can anyone verify) in my calves, quads, and glutes. What is this, and does it have a training application?

Pic unrelated, but Gym Jones and therefore awesome
>> Anonymous
Lol, saw this question earlier but had no input. Guess nobody else does, either.

Since I'm already posting, I'll just say that 1) doing that is probably hard on your joints (but good for yer bones) and 2) the shock is not a contraction but your muscles literally being jarred. You MIGHT get a good contraction in your quads, but the rest is just the energy of your feet slamming into the ground reverberating around your legs.
>> Anonymous
>>153453
>What is this

Uh, It's called pain due to rapid deceleration. Your body is moving, and it has to stop REALLY fast when it hits the ground.
This is the same thing that would kill you if you jumped off of a building.

Watch someone do depth jumps, there's no slamming of the feet into the ground, there's no excessive jumping off whatever platform you're using; just step off.