Hi Sophie!
All these smart-aleck women around here. . . sheesh!! (grin). Listen, Debbie H has the right idea! NOTHING works in the butt-perking department like the Firm. I thought that I just didn't have the genetics to build a butt. I have always had a flat rear end and although I could TONE it I couldn't LIFT it. But I tell you, the Firm has made all the difference. You will have to find something to use as a "tall box" --a 14" high step that the Firm sells. There are a lot of things you can substitute, notably a Rubbermaid toolbox/stepstool combo that is 13" high. Anyway, the Firm does a lot of leg presses on the tall box and I have developed quite a butt! My little tummy pooch used to be bigger than my butt. Now my butt really sticks out there! I caught sight of myself sideways the other day and thought "WOW!" --visible results! My husband complimented me and said "honey, your butt is, well, it sticks out more! --I really like it, I mean, that's supposed to be a compliment!" hehe.
The thing the Firm DOESN'T do very well is stretch your quads. And when you're doing all that tall box, YOU BETTER STRETCH YOUR QUADS or you'll get sore right above your knee. . . So definitely spend some extra time doing that. Tapes I particularly like for their tall box work include Firm Cardio (also has some great, slow forward lunges), volume 6 with Jayne Poteet (also has some hover squats), Maximum Body Sculpting with Tracie Long (a little more intermediate), and a lot of people really like Tough Tape which is cheap, available at K-Mart (along with Tough Tape 2, don't be confused), and has TONS of tall box presses (I don't like TT but I am definitely in the minority). GOod luck and happy butt-building!