Donna, I do mostly interval workouts and I've recently started doing some bootcamp style workouts as well. My knees aren't the greatest, so I have to be careful about how much high impact is involved. I order all my DVDs through a great online company, that has literally hundreds of DVDs to choose from. I'm not sure I'm supposed to post their info here, so if you'd like more info, please email me and I'll give you the details.