TRX: A total workout?

The claim

The Fitness Anywhere TRX can "make your body a machine," using "fast and effective workouts." On the box, it's claimed, "vector resistance ignites your metabolism and targets every muscle." We bought a TRX Pro Pack, which includes the 2-pound device, a door anchor, and a 35-minute DVD workout for $200 plus $7.35 shipping on Amazon. It's also available at the manufacturer's website, www.trxtraining.com.

The check

Seven male and seven female staffers of different heights, ages, and fitness levels worked out with the TRX twice in our labs. To use it, you need the door anchor or a TRX Xmount ($34.95), which is screwed into a sturdy wall or ceiling beam. You also need an 8x6-foot area to work out. Your weight creates the resistance for the muscle-building exercises.

Bottom line

The TRX works. Our workout panelists liked it, and our fitness expert said it can effectively train major muscle groups while working your core. The DVD is comprehensive and shows how to intensify each exercise by changing your body's position (that's what "vector resistance" refers to).

A few nits: It's not inexpensive, and the TRX can be challenging for a person with limited flexibility, mobility, or strength. Indeed, some panelists initially complained about exercises that required them to put their feet in the handle stirrups and flip into plank and push-up positions. And don't expect to look like Ms. Amazing Abs in the DVD. Not at first, anyway.