Hey mister mantis

be still and don't strike for a minute and I will explain
Have you not seen these things? You spin up the rotor with the little ripcord (or with the palm of your opposite hand once you get the knack

) and then just rotate your wrist. It takes all of 30seconds to get used to. There's a little counter on top to track your revs. You can imagine the torque coming off 12000 rpm. If you hold it with fingertips the effect is notable! For me great for strengthening grip and wrists for practise. For you great for either open palm or closed fist techniques. A right laugh in the dojo too. Guys are SO damn competitive I couldn't get it back at the end of the night, ha!
OK, I've finished, you can strike away now
Yr most obdt hmble srvt,
Jenna