Hey guys, It's Henry here today and I've got a buddy here that's gonna teach us how to do one of the toughest ab exercises out there... The human flag. This is my man Mike D. And he'll be showing us how it's done today. So one of the things you need to be able to do the human flag is of course, a lot of upper body and ab strength, but also a high strenght to weight ratio. That means that being heavier or having more body fat is going to weigh you down or make it tougher unless you're insanely st