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Nah... I got some better excercises for wrist strength. ;)

No troll.
Seriously. Bag work is wonderful. Work combos, then just go all out on it for rounds.
Jump rope is great too.

Situps till you cant situp.
Crunches till you cant crunch.
Pushups till you cant push.
Curls till you cant lift your arm to drink water.
Jump rope until you are abou to puke.
Beat each other up....