I've taken many yoga classes in the last few decades--even 'chocolate yoga' in which you put a cocoa bean under your tongue before doing your poses--disappointing, I'd hoped it involved a few pounds of Godivas or a few dozen Lindt truffles. But what really sold me was my personal trainer, or more specifically, her arms. I asked her how many pounds she was currently lifting, and she replied, "It's from yoga." Zowee!!!!! (she's also a yoga instructor at the gym I belong to).
I went straight to Amazon and sifted through the gazillion yoga DVDs for sale, and settled on Meaghan Kennedy Townsend's "Element Targeted Toning Yoga" which includes three 20-minute sessions, each concentrating on different areas: Thighs and Glutes, Arms and Shoulders, and Abs and Core. The poses aren't that hard to do, and I like that I can split it up or do all three in one session.
I never thought yoga was a good way to tone
up or lose weight, and in the classes I'd taken a lot of the poses are uncomfortable, and my back just won't
do some of them. But I slowly got hooked.
I strongly recommend you give it a try!