Twinning appears to use a completely different muscle set to hiking.
I got cramp yesterday in marginal twinning conditions, not sure I have done so many squats in a day ever. At the end of the outing we also discovered the kicker tang had crept back along the boom, this explains why we felt we were lacking power when the kicker was block-block fully on, the mast did not appear to be moving in the gusts and the head was like a barn door. Probably would have been full on if we had actually had the rig set correctly :-(
I also have taught H to move, she has got into a habit of just hanging out on the wire with me doing sit ups to alter the weight, she found this a bit strange but easier when she moved to a shorter trap line! We were a little pi$$ed not to finish a Medway race (again) as the idiot helm got lost when maxxing it downwind; we had sailed a mile in the wrong direction before we approached a buoy to find it had the wrong number on it

But the reason for the post:
1) How do I stop the top of my thighs feeling like someone has got medieval with a blow torch on them?
2) What other activity uses these muscles, coz they need some strengthening?