Just wanted to add this, since no one else mentioned it. I got a few compliments on my butt when I was doing Slim Series. I was actually surprised when I received the compliments and I had to stop and think what I was doing at the time. I personally had always thought the Firm had helped that area for me initially and then I felt deadlifts, kettlebell swings and barre kept it up. But the compliments came when I was doing SS, so there ya go. I should get back to it