I asked around here a while back what I could do. I ended up fighting again (Savate), but after a month I found that my knee and shoulder were starting to struggle again. I totally love it and I'm pretty good at it, but my passion is climbing, so I quit.
Started indoor rowing and been doing it for a while now. I'm really starting to love it. Great workout. Can recommend it to everybody. It keeps most of my body fit and I'm getting a great cardio workout.
Just thought I'd give some feedback.