This amused me: The Entertrainer. No, that’s not a mistype, it’s a device that can control your television to let you know how well you’re exercising. It monitors your heartrate and if you aren’t working hard enough it turns down the volume, conversely, if you’re working too hard it turns the volume up too loud. If you’re being really lazy it will turn the TV off!

It’s quite a bizarre idea. The heartrate is one of the most important factors in training and long routines can get pretty dull, so this gives you feedback on your performance as well as some entertainment while you’re exercising.