I was paying special attention to my posture...slightly bent elbows to absorb the vibration, wrists not bent weird, back straight/flat. It was actually the spot between my pointer finger and thumb that was getting tired. It wasn't painful, it just felt more like a spot that had never been used to support my weight before. Between my shoulders was getting a little tired too. I just think those spots need a little more workout to strengthen them. The only real pain was my girly parts...they are still burning. I'm reading through old threads and wondering if I just need chamois creme?