Boxing is all about technique.
1. Defense:
Floyd has moved up in weight and fought champions several times but lets use just these as examples:
v. De La Hoya landed 21%
v. Gatti only 17% landed
v. Marquez landed 12%
v. Cotto landed 21%
So you see, bigger larger champion boxers have a hard time landing against Floyd
2. Punching Power
Force=Mass x Acceleration
Timing
Location
watch this woman boxer hit as hard as a man boxer, the key is technique
http://www.youtube.com/watch?v=_mfn5As4G5o
3.Speed & Skill
Why speed and skill matter more than mass and size in boxing:
4. Nasty Factor
ask yourself if you had to fight someone in the ring or street would you rather face Floyd or Lebron? Floyd would kill you Lebron might only hurt you
Floyd can't hold a candle to Lebron in hoops, and vice versa