Try a few find something that suits you and I don't mean just something you like but something that suits your body shape size etc. I've tried Karate, wing chun kung fu, akido but settled on 15yrs of Tae Kwon Do both traditional and WTF competition and now I Know I'm too old for TKD but still stay fit and practice at home.
As for ju jitsu being gentle, one night at TKD senior black belt class we had 2 senior Ju Jitsu bb"s come in for demo's, my
wrist's and arms have never been sore sore.
