vaultwest wrote: I am surprised the posters that think that the arms especially the bottom arm do nothing or very little in a jump have not pounced in here and commented ...
OK, I'll bite, since I'm one of the posters that claims that the bottom arm should be used just for balance DIRECTLY AFTER TAKEOFF - not for bending the pole.
First, please realize that what I just wrote is quite a bit different than you saying
vaultwest wrote: ... the bottom arm do nothing or very little in a jump ...
I hope you can keep these 2 ideas separate. I talk about directly after takeoff ONLY, whereas you talk about "in a jump". But also, I don't think you need to row VERY HARD or VERY OFTEN if you swing properly. And Hooker DOES swing properly! (Not sure about his lead leg dropping tho, but that's a different thread.)
Read on.
I watched all of Hooker's televised jumps in Beijing, so I'm basing my comments on that, as well as on my personal experience. Hooker has a very good "natural swing". He doesn't "muscle-up" much - if at all. At least not in the Olympics, he didn't. That doesn't mean that he doesn't need to be strong, tho. Just not super-strong.
You need a STRONG (but not super-strong) bottom arm (and top arm) to vault at the elilte level. I will conjecture that the biggest difference between male and female vaulters is strength. Some speed differences too, but mostly strength. (Not much difference in gymnastic coordination - the gals are very good compared to guys).
I will talk about 2 distinct issues here: (a) strength IS important at the elite level; and (b) Hooker wasn't lifting much weight - they were very light bars.
To be honest, I was surprised how LIGHT the weights were that he was lifting, but now I can see how he keeps his trim physique.
In the vid, the only 2 lifts that he did that relate to the arms were behind-the-neck presses (needed for a good, powerful plant- BEFORE/DURING takeoff - BEFORE the pole hits the box), and hanging rows (a very nice excercise to simulate your arm action during inversion).
Vaultwest, you must be referring to the hanging rows, but really, they were such low weights that you could hardly say that he was trying to gain super-strength here. Really, it was just general strength/conditioning that he was doing, albeit focussed on a vault part. How could you conclude anything else by watching the vid?
Now on to why being strong is GOOD for elite vaulters (as long as they don't bulk up like Tarzan - Don Bragg) ...
What do you need to use the bottom arm for AFTER the pole starts bending by the force of JUST the top arm? Well ...
1. ... to swing from the "backwards C" to the "forwards C" (so-to-speak) as quickly as possible - during the whip. This takes gymnastic skill, yes, but the QUICKER you can do it, the more potential energy you add to the pole. To be quicker in this vault part, you need to be stronger.
2. ... NOT to finish your upswing to an inverted "I" position. If you swing PROPERLY, you don't really need much strength here.
3. ... to guide yourself into an inverted position when your vault is off a bit (nobody vaults with their perfect, intended form on every vault). EVERY elite vaulter does this - perhaps even the majority of their jumps. i.e. less than half their jumps are "perfect". Far less than half, actually.
Vaultwest, you call it "row/press/lever/pull (whatever you want to call it)", and I'm not going to try to describe this vault part any better than that right now, other than to say that on MOST vaults, you only need to do a bit of this (i.e. your swing - like Hooker's in the Olympics) is USUALLY close enough to your INTENDED technique that only MINOR "adjustments" to steer you to the ideal inverted I position are necessary.
This is NOT the same as saying that you need to use a LOT of muscle-power to row (or otherwise muscle your way to an invert) as a regular part of almost EVERY one of your jumps.
I hope you can understand what I'm getting at. Your intent should NOT be to use a lot of muscle-power, but when you're under or late or whatever, you need to make immediate, STRONG steering adjustments to get you back into the groove (to a correct invert).
Also, did you notice Hooker when he was walking on the track after his victory, into the arms of Parnov? I was quite impressed with his physique. This was quite easy to see, as his jersey was soaked and skin tight. But his lats, pecs and abs were LEAN!!! Not much bulk at all!!! Now THAT'S what you need for a great strength to weight ratio!
We just saw his weight program, so we now know why he doesn't bulk up. Light reps only! He's NOT power-lifting!
His last words on the vid (he was referring to how hard his weight workout felt) ... "I'm not really pushing myself much ..."
Kirk