7:39

Demetrious "Mighty Mouse" Johnson leads a mic'd-up workout monologue at a gym in Puyallup, Washington describing his weekly weightlifting routine (typically Mondays, with an optional Wednesday upper-body session), why he largely avoids heavy leg training because of prior knee injuries, and how he prioritizes explosiveness and conditioning over maximal strength. He demonstrates a pre-workout supplement (mentions ~5 g creatine and caffeine dosing), performs treadmill sprints to raise his heart rate to ~185–190 bpm and reports recovery from ~180 to ~130 bpm in roughly 40–50 seconds, and explains a training focus on higher-rep (~20) sets to build endurance for grappling. He also recounts past injuries (LCL, MCL and popliteus tears; surgeries on both shoulders) and emphasizes training to stay healthy and set an example in retirement.

Questions this video answers

About 5 grams per full scoop.

Full scoop ~300 mg caffeine; he typically uses a half scoop (~100–155 mg).

Approximately 185–190 beats per minute.

He reports reducing from ~180 bpm to ~130 bpm in roughly 40–50 seconds (he mentions both 40 and 50 seconds).

He ran sprints within a ~10-minute session and estimates about 2.10 miles.

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