I have used Pilates before with working out and had great success with it. It really lengths and tones the thighs and stomach. It uses the core muscles. The video I have is really a pilates/yoga mix. It is mainly Pilates but there are a few yoga poses as well for your back.

I haven't gotten around to it today. I want to start incorporating it this week.

The tape I have is by Denise Austin and is good if you don't mind her "perkiness". Some people don't like her but I do.

I hope that information helps you! Let me know if you give it a try.