I bought this specifically for the Jillian Michaels 90 day workout. I am about a month in, and it has been okay. It was the perfect size for weeks 1 and 2, and a little bit off for weeks 3 and 4. However, the quality of the band is excellent. It is very sturdy and the handles are comfortable in your hand. They have a lot of different levels of resistance, so you could probably make a good set with these varieties. I would suggest this band, but maybe not for the Jillian Michaels Body Revolution (unless you buy a few).