Power 90

beachbody.com $59.85

Pros: “Solid sweat!” (cardio) and “sculpt!” (weight training) routines led by the likable Tony Horton.

Cons: The cardio routine’s series of intense “power yoga” moves require proper body position, virtually impossible for anyone lacking prior yoga training.

The Firm

firmdirect.com $89.95

Pros: For some women, the we’re-all-well-toned- sisters vibe will be comforting.

Cons: For some women, the we’re-all-well-toned- sisters vibe will be sickening. And, it’s humiliating using something called “the fanny lifter” (it’s a step).

Tae Bo

taebo.com $34.95

Pros: The grand-daddy of infomercial fitness, Billy Blanks, does deliver surprising results with simple, easy moves. Perfect for beginners.

Cons: The advanced tape is a killer. If you can do the shorter novice routine twice in a row, you might be ready to move up.

Winsor Pilates

winsorpilates.com $39.90

Pros: Clearly explained muscle-toning exercises that don’t require any special equipment.

Cons: Other than the models’ drab green unitards? With pilates, you don’t get the perverse joy of feeling sore or the fun of working up a really good sweat.