Yeah he was also great at cutting off the ring. The reason he left himself so open against Ali is because Ali totally left himself open for George, all those huge, ugly shots to the ribcage. George never stopped swinging until he ran out of gas, unable to believe that Ali just wouldn't fall down.
he was good at timing people as they came in as well. but yeah mainly it was just brute strength. his training regime was mental: bench press a cow, wrestle an ox then rip up trees for firewood with your bare hands. got to love big george.
Obviously his power, which came from his raw out strength. Unarguably in my mind the strongest heavyweight physically of all-time. He had a very good chin on the whole, and an intimidating presence. He had guys beaten psyschologically before they'd even entered the ring. His ability to cut the ring off was also under-rated. In his comeback, he reinvented himself, or more specifically after the loss to Ali. He paced himself more, and worked more behind a stiff jab. The reason his comeback was successfully - along with importantly not being shop-worn, just old - was this new Foreman style. He was still very durable and proved his chin more in his comeback than his original career, he was still powerful and still strong physically. He timing seemed better, and he was in general a smarter fighter.
What made George Foreman good? The George Foreman grill ofcourse. Nah but seriously...unreal power, great chin, etc, etc...havn't read through any comments but I'm sure it's all been pointed out. :good
Axel Schulz still deserved the win over him in '95, mind. Yeah I know, old subject, but it's true. Schulz should've been linear champ. For all his ring smarts and toughness, old George looked really like Old George that night.