What made Foreman so strong?

No way! Knocking out an inactive and fragile Cooney should not be exhibit A in terms of establishing what a great puncher a fighter is. Cooney never was the most durable of fighters, and combined with his long history of drug/alcohol abuse and inactivity, his durability didn't figure to get any better. I admit George was a powerful puncher during his comeback, but to say he was the hardest hitting heavyweight at the time seems a bit of a stretch!

 

Foreman did some weight traing but strickly arms but he converted the power into hitting the bag, the rest of his body was pretty lean but he was slow and ran out of gas but as far as clubbing power, Foreman was the man