The rules for the Ball Fucking Harder Challenge are easy. First, I recommend getting some Yoga Tune Up® balls to roll on. All you have to do is post a pic or video of yourself doing the technique and tag me (@coachpanda). Use the hashtags #ballfuckingharder #30daypandachallenge #supplepandas #pandiculation. The challenge is even better when you share it with friends so tag your friends to play along.