todays ; private 1hour B.M.L.T.5set , group 2h15min.
It is more important for us to practice service .
Move weight correctly enable pivot like Federer .
He has to repeat this many times .
So , we use a weight ball(1kg) .
Make service movement then pretend to toss a ball .
If you can use a body trunk , feel it light .
If you can't , feel it heavy .
How wonderful Federer is ....