So much fun! Loving them, they are the best exercise I've found. Also, much more tiring than I expected, and it certainly gets my heart rate up and gets my whole body warmed up. I've been following the introductory videos from here and it's not quite what I expected - the momentum pulls your arms away from your body and there is quite a strong pull, even at the slow speeds I'm using, so must be more when you get up to the speeds that guy can do. So far I haven't hit my head, which I expected to happen. In fact, I can't even see how you could hit your head now, as the clubs are kept quite far from it. I have clocked myself on the knees, and on the shoulder blade, however. I can feel a change in my back and shoulders already, with some muscle pain, and stretching, and LOTS of joint clicking at first, until the joints warm up and get into the swing of it. After a few short sessions, there is quite a lot of muscle pain in my left shoulder and left upper ba...