Although in early 1998 he was still able to do five reps in the bench press with 495 lbs, three reps in the squat with 855 lbs (with no suit and no knee wraps), and three reps in the standing press with 405 lbs in training, while traveling with the World Wrestling Federation , he never returned to compete again in official championships in favor of his wrestling career.  He weighed 380 lbs at that time, and his right upper arm was measured at 24” by Terry Todd .  By basically ending his lifting career at the age of 26, it is probable that he never reached his full physical potential as a professional lifter. Henry remains the youngest man in history to squat more than 900 pounds without a squat suit as well as the youngest to total more than 2,300 pounds raw  – he's the only person ever to have accomplished any of these feats at under 25 years of age. 
I noticed one thing. After spending two weeks mountain climbing (intensely — there was snow so it was really strenuous) I go back to the gym and find I have way more stamina and am able to push myself much harder in the same exercises I did before. But I know one could not replicate that same kind of thing at the gym. The boring quality of the gym — like a sensory deprivation chamber compared to outdoor mountain climbing — dampens down your brain and makes it tough to push yourself hard athletically. Whereas, go mountain climbing, and you are all preoccupied with getting to the top, to the point where you forget how tired you are.