We don’t rotate by momentum of tucking at all
[Summary]
The tuck and pike forms contribute to increase the speed of rotation because the forms are efficient for rotation.
We cannot add rotation in the air so it’s very important to have efficient posture for rotation.
Not the slightest rotation is initiated by tucking.
Tucking doesn’t generate the momentum of rotation at all.
However, We can see that the chest is fixed in the air and the knees are brought to the chest when somebody is tucking or piking in a good back flip and it looks the one gets the momentum of rotation by tucking.
It looks as if he brings his legs to chest and it looks he rotates by that momentum but…
At first sight, imitating this looks like it would improve our back flips, but in reality we cannot imitate this action alone.
If we intend to bring our knees to our chest when tucking in the air, our chest goes to knees as much as knees go to chest.
After you take off, tuck as fast as possible without thinking.
– You can experiment legs and chest approach each other –
You can experiment by piking after jumping straight or lying on slippery floor. The upper body and lower body will be reaching each other without any fixing because there is no friction to constrain both of them.
This is based on the same principle.
If we rotated by momentum of pull in our legs to our chest, we must rotate backward when tucked side flip.
He tucks but doesn’t rotate backward, because our rotation(in this case it is forward with respect to running) is determined at the moment of takeoff.
Tucking doesn’t initiate rotation
[Details and Theory]
As previously mentioned, your chest goes to your knees even when you intend to bring knees to chest. It is called a “reaction”
(cf. Basic Ideas of Physics).
A new question arises.
How can people fix their chest in the air and bring their knees to their fixed chest in a good back flip.
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– Original rotation and tucking “reaction” rotation offset each other –
The answer is that rotation has already started.
Though chest goes to knees (converse rotation) by tucking, the whole body has already started rotating; so as for the chest, these two movements offset each other and the chest won’t move.
As for the knees, since movement toward chest is added to the original backward rotation , knees will be moving at twice speed of the original rotation.
If your chest looks going to your knees, your original rotation is little and it’s not enough to offset converse rotation by tucking.
In that case, the point to be improved is not your tucking.
It’s your original rotation, so you should improve your takeoff.
We can explain the fact that upper body and lower body approaches each other with the principle of reaction of abdominal muscle which contracts for body to pike.
It is not that because of good way of tucking we can get increase the speed of rotation, but that because of the original good rotation we are looked as having good way of tucking.
However, it is sure that there is certain amount of people who needs the image of bringing knee to chest for taking off with warped back.
– Rotation speed is determined only by form (and how much you put strength) –
It is absolutely not that we get rotation by the momentum which is generated by bringing lower body to upper body.
We can increase rotation speed with smaller and more efficient posture for rotation by getting lower body and upper body close.
It means that as to piked flip since our body has gotten bigger and less efficient for rotation, the rotation speed has decreased until our waists get straight.
The springs which doesn’t fall is related to this Tip.