The Well blog on the NY times published an article, Switch Sports After Injury? Never! which I responded to: Although I appear as a single-sport person to many, I've always had a bit of a need for change, and paired with my inevitable stress injuries that came from just running, or biking, or rowing, I gladly changed sports before I did serious damage. Even then, my relatively extensive training knowledge - I was certified as a personal trainer through ACE in the early 90's - taught me the need to training hard-easy, with intervals days followed by something longer and lighter, as well as active recovery. I recently met someone who claimed to play four (4) hours of aggressive tennis almost daily. He related that he had developed a nagging injury and wanted to know my suggestion for resolving it. When I suggested he should takes some days easy, or replace tennis with weight-training, he was adamant that he could mange with his current regimen of icing and stretching, eve...