If you like yoga you need to check out my favorite new exercise site -  yoga today.  They broadcast a different yoga routine every day and the sessions are an hour long.  It's great because you get the variety and challenge you expect from a class without having to go anywhere.  Plus, you can workout whenever you want.  The routines are intermediate to advance, so if you are new to yoga proceed slowly and do what feels good to your body.  Namaste.