Furthermore, interval training is much more “costly” in terms of recovery, related to those central fatigue factors I briefly touched on earlier. Hopping on a stationary bike for 30 minutes with your HR at 130-135 won’t really affect your training very much tomorrow. Doing a few tough rounds of intervals (assuming you’re going hard enough to actually make them effective) can really put a dent in your ability to recover from your strength training, though. The idea of improving your conditioning in less time while doing fun movements sounds great on paper, but you pay for these advantages in how intervals can negatively impact the rest of your training.
All of those other factors (apart from muscle size), particularly segment lengths and muscle attachment points, largely explain why some relatively light people who aren’t overly jacked-looking can still lift huge weights. It’s not that their smaller muscles contract any harder than yours do; it’s that either they have body segment lengths that are advantageous for a certain lift, requiring less torque to lift a given weight, or they have muscle attachment points that allow them to produce more torque at a joint with the same force of muscle contraction. There wasn’t any special training that allowed them to lift heavy weights with relatively little mass; most of it simply has to do with how they’re built.
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.