Holding bat Loose and Tight

is there any effect with tight and relaxe grip for the stroke ? maybe the power or what ?

I think you can generate more power with a relaxed grip because you can use all of the muscles in your body effectively.

ah ok.. thank you very much :D

anyway, what do you think about this

Loose Grip

In general, a loose grip is used when you are trying to help reduce the effect of the power or spin of an opponent's shot. Holding your racket slightly looser allows the racket to move a little more backwards when contact is made, thus causing more of the pace or spin to be absorbed by the racket itself. I think this is what the coach meant when he mentioned borrowing the spin of the opponent, you are controlling their spin without imparting much yourself.

A loose grip is also useful when you are attempting to play a touch shot, such as a gentle drop shot over the net from the return of serve. Loosening the grip allows you to hit softer than a firm grip, which can help when you are trying to hit a double-bounce return. Defenders sometimes use a loose grip to help absorb the pace and spin of the ball when chopping as well.

Firm Grip

Using a firm grip when you want to impart your own spin on the ball also makes sense. In these situations you usually want to get as much spin or speed out of your stroke as you can, so a firmer grip will allow a better rebound from the racket, increasing the spin and speed.

Having a firm grip will be helpful when you are trying to loop, reloop, or block the ball with pace. A heavy push would also be easier with a firm grip.

I agree with the comments on the loose grip.  I think you can achieve all of the things talked about with the firm grip by having the grip loose and allowing your muscles to work naturally.

oh ok then

thank you very much :D