O'Hearn starts his session focusing on biceps, so that means lots of curls. He works through sets of incline curls, then spider curls. And while the movements might look repetitive, O'Hearn is all ...

4-times Mr. Universe Mike O'Hearn has inspired countless individuals through his workout motivation clips and reverse aging physique.

Reverse-aging bodybuilding giant Mike O’Hearn has inspired countless individuals to take up fitness and bodybuilding over the years.

O'Hearn's chest and arms might have made an appearance as well. Yes, Mike O'Hearn is the bodybuilder lighting up TikTok, and he hasn't gone viral because of a recent win, acting gig, or anything else.