Platform Jumps Question-

[Becoming]

I generally see two versions of platform jumps performed. The first, where the legs are only brought up enough (or maybe just kept bent really) to cushion the landing (example C)....This is the type I have done mostly in the past. The second type the person brings the legs as high as possible to land on a higher platform (example B)... In both versions the Vertical Displacement is the same (from the height of the hip before the jump in A)

Is there any added benefit to version B (with the higher box?) I could see how this might be useful to individuals who may have to bring the legs up after jumping etc (long/triple jumpers, hurdlers, etc) But for the most part, it seems both would be exactly equaly in helping to increase the vertical jump... And it seems if B did not have to be done, C would be less dangerous...

Thoughts?

 

[Becoming]

PS- Thanks to t3c for showing me how useful MS-Paint can be in his previous posts....

 

[slobberknocker]

Maybe it's a mental thing. The higher box requires a lot more concentration, so you really have to focus on explosion. Don't know though.

 

[Exodus]

i think its the same technique. just on box C you dont have to bring your knees up as much as in box B.

what your talking about really, is why on lower box's does someone stand up completely, but when they get to high box's bring thier knees up to land on the box, but not straighten them to stand up.

i saw iron lion jump on to a "B" box and then he stood up. so i guess its just preference. if you jump up to box "B" and are doing multiple reps fast for 1 set. then it takes less time to get down off the box that way, then standing all the way back up, then jumping back down.

X

 

[Tagio]

actually in example B the person had to jump a lot higher than in C. look at their centers of gravity - though their head is at the same height as with the lower box, their center of gravity is noticeably higher in B because of where their legs are. to make the center of gravity higher the jumper had to explode more off the ground.

In other words pulling up your legs while you're in the air pulls the rest of you down. this is why you leave your legs straight when you're trying to reach something high in the air like a basketball hoop - tucking them would pull your torso down as much as it pulled your legs up (try it and see).

high box jumps just let you push yourself to really jump as high as you can, and higher than you think you can. I don't think there's any magical physical benefit to them, I just notice that with a C type box I don't end up pushing myself to jump maximally.

 

[Tagio]

Exodus I think what you're talking about is purely preference. Like that guy in the ironmind oly training clip who just bounced off the thing he was landing on rather than standing up. I think he was just trying to make it easier to do reps quickly in a row. I like to stand up every time because I have to jump higher and more precisely to land on top rather than bounce off. Purely a matter of preference though I guess.

 

[coolcolj]

I personally think box jumps are only good for absorbing the impact force, if your using say dumbells and weighted vest.

But if your doing them without any external loading, it's a waste of time, because you don't jump as high as you do when jumping free standing, your form changes and the eccentric loading from a maximal jump landing is a good training effect! You get a free depth jump effect without using a box!

Absorbing force is so important for jumping power. The stronger your eccentric strength is, the faster you can reverse the dip, the more of the stretch reflex you can utilise, the higher you jump!

There is a reason why Archuletta does 6 feet alttitude drops
And while your playing sports, there isn't a nice box that will help you reduce the impact forces

If you need to jump over a target use adjustable height hurdles.
Or a piece of string

 

[Tagio]

actually in my case it is a skill I want to develop because jumping onto rails and ledges is a big part of aggressive inline.

so is absorbing force, maybe this is why so many kids who do it have good vertical leaps despite not training. Landing a drop from 8-10 feet is pretty average in the sport, I've landed from 7-9 feet before and rolled away fine. This is dangerous of course, but actually not as bad as in shoes. If you are too weak in rollerblades to absorb the landing, your feet fly out from under you and usually you get a bruise rather than a joint injury.

http://www.be-mag.com/updates/0310/images/031031_ignition_tour/yves_fakie_360.wmv this is common type of trick

Also a grind on a ledge or rail is basically the same as jumping on to a box, then jumping off and absorbing the inital jump force + the force of the second jump off of the object. very tiring at first because you do hundreds of these in a few hours of skating.

 

[Tagio]

http://www.be-mag.com/updates/0310/images/031031_ignition_tour/frido_kindgrind.wmv

this is what grinding is like. pretty strong eccentric forces.