These lists always miss the point. For example, the list is most likely right about sleep. However, if you're not sleeping enough you'll most likely say "It's ok man, it's under control". Only when experiencing personally the damages of sleep deprivation you'll say "I should sleep more". Not because you read it on a list or your friend tells you. As for six packs, yes, it's important, because it will insulate you fro…
Good ways to make your back and abs stronger include squats, deadlifts and progressively loaded ab work.