Several of us here at Mashable enjoy working out, mostly to combat “the blogger 15,” but we also realize it is easy to get bored with the same exercises. We’ve put together a list of 15 sites with exercise videos that are bound to liven up your routine.

There’s no need to invest in expensive DVDs you’ll watch only once when you have a wealth of instructional videos at your fingertips. Try these and let us know which ones work for you.