Check this thing out.

Boxing Ask the Trainer
1

Dont know about its benefits for fighters :-\

http://au.pinterest.com/pin/43487952629093166/

http://au.pinterest.com/pin/43487952629093166/

2

does not look effective. FIghters needs tools that help develop ability to overcome faster the inertia. This is like rubber bands - tensions builds up at the end