Pull -Up Challenge lv1. Darebee, darebee, fitness, visual workouts, workouts, fitness challenges, fitness motivation, training tips, recipes, nutrition. ... <看更多>

Video Transcript. The challenge is, if you beat my friend Michael in pull ups, I give you $1, 000 cash. Oh, ... <看更多>

After completing 100 reps for 30 days, he has gained almost a pound of muscle, with visible gains in his back, which is, in his words, "way more ... ... <看更多>