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Kristin McGee's S3: Strong, Sexy, Svelte ($17, kristinmcgee.com)
What you'll need: A pair of 3- to 8-pound dumbbells, a yoga mat
Calories burned: 310 per 80-minute workout
The skinny: Testers liked the sculpting twist on poses, such as warrior II with a weighted biceps curl, in McGee's three 25-minute "interesting, fast-paced" yoga hybrid workouts. Do them back-to-back for a "killer sweat session" that left reviewers "feeling challenged, balanced, and focused." Tack on the bonus five-minute cardio segment included on the disc to bump up your total calorie-burn. "Perfect for those who can't or don't want to go to a studio regularly."