Running coach and marathoner Tina Klein says she tried the tape, but it didn't work for her.

"I have hamstring issues and I kept trying it, but the stuff just wouldn't stick to me," she says. "Ultimately, I decided to go the regular therapy route instead, but I know some people swear by the stuff."

Still, says Fletcher, "If it gives you a sense of stability and support, or gives you that psychological edge, why not? It's not going to harm them. It's pretty-colored cotton tape."