4. Swimming
"Hip"
It's the center of gravity when we do athletics.
More certainly say, the part which make the center of gravity is Dantian in Japan.
OK. Look at the below.
It's a start of swimmer.
People think starting movement is complex.
So it's difficult to say a theory for movement.
But it's a mistake.
Life is simple.
Sport is simple too.
You have to watch his center of gravity, hips.
He made 200M freestyle short course Japan record in 2010.
Do you understand ?
The starting theory is simple.
Free Fall Formula and speed of kicked out (initial velocity), we can calculate only that.
The answer is "throw hips straight out forward.
Just a simple theory there is.