I have owned a hub for a while and played with it off and on, but now I am getting serious about lifting 45 pounds on it. My goal is to do the crushed to dust challenge. I am doing sets in the range of 12 to 20 reps. I put the weight on the ground, let go and regrab for each rep. I just upped the weight to 27.5 pounds and got 13 reps. I am following the advice Laine gave over on the Rolling Thunder thread and using it for the hub. My question is about what most people find fails first? I would have thought my thumb would give out on me, but it is not the problem. My fingers do, particularly the tips and first knuckle. I use block weights as well, but it is my thumb that gives out there.