Quote Originally Posted by DD
Mike Tyson

(apparently every six months the size of the heavy bag was increased and the size of the speed bag was decreased).
I heard this from Rooney recently, but I'm pretty sure that wasn't happening in 1987. I'm pretty that by 1987 Mike had already peaked and it was just a matter of maintaining what he had and keeping him ready. But when Mike was a young kid (ie many years before 1987), I'm pretty sure that the heavy bag got heavier over time to increase his punch power and the speed bags got lighter over time to increase his hand speed.