Question about punch mitts training...?

Question

I was watching the Title boxing video about punch mitt training, and Jeff Fenech was talking about how a lot of trainers will slap the punch mitts against their fighters hands while they're training them. He explained how this is bad because your oppent will rarely if ever move into your punches, and also it can hurt the fighter's hands. however when I watch training videos of mayweather, and cotto, their trainers still slap the punch mitts against the fighter's hands. I was wondering if there was any reason for them doing this??

Answer 1

There are valid points on both sides.  The reason trainers will slap at the trainee is for a couple of reasons

1) To train at a moving target

2) To give a slight impact to condition the wrists more