The efficiency of human muscle has been measured (in the context of rowing and cycling ) at 18% to 26%. The efficiency is defined as the ratio of mechanical work output to the total metabolic cost, as can be calculated from oxygen consumption. This low efficiency is the result of about 40% efficiency of generating ATP from food energy , losses in converting energy from ATP into mechanical work inside the muscle, and mechanical losses inside the body. The latter two losses are dependent on the type of exercise and the type of muscle fibers being used (fast-twitch or slow-twitch). For an overall efficiency of 20 percent, one watt of mechanical power is equivalent to kcal per hour. For example, one manufacturer of rowing equipment calibrates its rowing ergometer to count burned calories as equal to four times the actual mechanical work, plus 300 kcal per hour,  this amounts to about 20 percent efficiency at 250 watts of mechanical output. The mechanical energy output of a cyclic contraction can depend upon many factors, including activation timing, muscle strain trajectory, and rates of force rise & decay. These can be synthesized experimentally using work loop analysis .
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. 
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