It's the "snowball effect." Probably can be blamed on George Foreman. The guy won the championship on his comeback when he was what..... 45, 46 years old? Now ALL past heavyweights want to come back and fight into their 50's. Why not?

First, there's the money issue. Who doesn't want to earn a few hundred thousand for retirement?

Then, there's the competition. What past heavyweight champion wouldn't drool at the mouth at the prospect of winning a championship from a John Ruiz, a Valuev or a Briggs?

Finally, it's the physical shape factor. It's not like these guys have to bust their a$$ to get in shape. All they have to do is take a look at James Toney, the poster boy for obese heavyweights.

And with heavyweights, all it takes is one lucky punch and PRESTO!....... an instant championship.