Since I just started riding the fixed gear, I think I've caused myself a problem: I went to play basketball last night and suffered a scary moment of sudden, shooting pain in my left knee. From talking to my friend, a doctor (though NOT an orthopedist), I'm pretty sure that it's patellar tendonitis. Anyone out there know some good exercises, or have a link to some specific leg-strengthening, at-home therapy for this? I'm 33, in decent shape, skinny, with no history of knee/joint problems. I'd like to continue riding the fixie, but I just think that the negative resistence is putting too much stress on my non-dominant leg, and I don't want to exacerbate.