Insanity Plyometric Cardio Circuit DVD. I read up online beforehand so I knew what to expect, and this was TOUGH! In the beginning of April I had a really terrible step aerobics class where I felt dizzy and weak and sick. I had eaten poorly the day before and was probably also dehydrated but I secretly worried it was the vegan challenge doing it. Any worries I had about having less energy on a vegan diet have been completely dispelled because I ROCKED this workout! (and every workout since that terrible step class as well) It almost makes me want to invest in the set.