I've been trying to decide whether I should get some for a while. My mom's starting to develop arthritis in her hands since there's a history of it in the women on her side of the family. Since her birthday was recently I decided I'd pick her up a pair as I know a few people who've had these marvelous little things stave off arthritis. Anyway I got her a set of smaller ones and myself a set of larger ones. They're both made of solid onyx and mine are BIG. Cue the ACDC because... I've got big balls. Oh I've got big balls. Seriously I got the big 7cm ones because I want to use them ton increase coordination and strength if possible. I know you're supposed to work up from smaller but I can do basic baoding exercises with pool balls so what the hay. Anyway I started today and my dexterity on the left is pretty bad. It got better throughout the day. I took my girlfriend with me and she needed to go shopping after so I sat waiting for her and playing with my balls. After a while though my forearms started to burrrrrrrn. My hands are pretty strong even when I'm not in the gym regularly. Chock it up to those years and years of aikido. This is entirely different though. My forearm muscles aren't used to this kind of continual full range of motion exercise. It's a lot different than grippers for example. I'm looking forward to increasing the dexterity if my left hand and strength it seems too! I'll post updates over the next little while as I keep using them. Next up... Building Indian clubs out of plastic bats and sand!