Either rowing and 9 or sledding and 18. I prefer the latter. I've already played a couple short course 9's with my son snd doc says I can swing away full blast in about 2 weeks - row too (but 1/2 days at first). Cow' or 'Nooch would be fine. U 2 know my e-mail. (So does Shania; she knows fine eel!) - Steve