Henry Armstrong. Btw being ripped doesnt mean you're in great shape, countless times we have seen guys ripped to shreds gasping for air after three rounds.
if u mean conditioning i agree with henry armstrong and i think i can make a very good case for bernard hopkins as well... if u mean who is the most ripped... i think steve cunningham, (young) mike tyson, roy jones jr. and david haye are some good ones.
Calzaghe is an example of a guy that never looked particularly ripped but he had immense stamina and could throw punches for days.
Joe Frazier Marciano Prime Hopkins Prime Duran Joe Frazier is really my answer because I think he's the best conditioned HW boxer in history...period. Marciano, Hopkins and Duran deserve to be mentioned so I included them in the list.