You may not be a bodybuilder, but if your training is no different than that of bodybuilders – that is, training based on principles of Hi Intensity Interval Training (HiiT), any variations of HiiT (e.g. Tabata, bootcamps, spin classes), and/or heart rate or power zone training – then you are training to develop STUPID muscles. That you are burning hundreds upon hundreds of calories, churning out more wattage than ever before, lifting more weight than ever before, sustaining an elevated heart rate longer than ever before is irrelevant to your potential at delivering a peak performance in sport because this type of training is solely applicable to competing as a bodybuilder; its absolutely useless for any athletic competition that involves speed, endurance and movement quality (i.e. technique/skill).
If your training is focused on developing STUPID muscles, then you are exposing yourself to undue risk of injury and illness because STUPID muscles are so STUPID that they typically overwhelm the tendons that attach them to bones, the bursa’s protecting the bones beneath the muscle, the ligaments and cartilage of joints the muscles move. If that wasn’t enough, STUPID muscles due to their overwhelming demand for energy overwhelm the cardio-respiratory systems and compromise the immune system rendering you constantly vulnerable to coughs, colds, congestion (sinus/chest), not to mention the flu and all other types of infection. That still isn’t the end, because the sheer mass of STUPID muscles demands extraordinary periods of rest and recovery during which the muscle is at extreme risk of significant damage (i.e. strains & ruptures) which precludes consistent day after day training; bodybuilders often train a muscle group only once a week to rest sufficiently prior to another training session.
Disagree? No problem, but ask 9x Mr Olympia why he has had countless low back surgeries, neck surgeries, joint replacement surgeries. If HiiT and zone training are so smart… then why is he is unhealthy? Why is he so prone to injury with so much muscle? And, why do so many bodybuilders fall over dead from enlarged hearts, atherosclerosis, heart attacks, TIAs, strokes (and not forgetting… drug overdoses and suicide)?