If you had said you never found them, I was going to let you know I found a pair in some grass just off the road about 6 years ago. Wore them everyday till I lost them. On topic-I actually like my XMetals for sports. Never had a problem with bouncing. Ichiro didn't mind either.I wouldn't really recommend them for running, or biking, they are a bit too heavy and move around too much. I tried doing a bike race with some Juliets once after my luggage that had all my radars/jawbones was misrouted by the airline. I wore the Juliets on the plane so I still had those. They were moving around so much a had to throw them off in the grass along the road and go back later with the team car to find them. Aside from that the lenses and field of view are too small for cycling. You'd be much better off with a radar or something like that, at least for those sorts of activities.