Resistance bands are a popular workout tool that can help tone every muscle in your body. Millions use them safely, but can they dangerous? Former Nevada Sen. Harry Reid, 79, claims his life was ruined after he used an exercise band and he's suing the manufacturer of the particular one he used, TheraBand. The incident took place in 2015, Reid said. He claimed the device slipped from his hand while he was using it, causing him to fall and smash his face against a bathroom cabinet.