Can You Work Out Less, Get More Results? @ WSJ.

The pressurized belts cause the limbs to fill up with blood. Muscles are activated and lactic acid accumulates, say some researchers who have studied exercise when blood flow is restricted. That tricks the brain into thinking the body is doing more intense exercise, which encourages muscle growth and burning of fat and helps the body repair injuries faster, say proponents of the technique. Other researchers say the ways in which restricting blood flow helps encourage muscle growth, even with a light workout, aren’t completely understood.

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Also called occlusion training, one to watch and see if it’s ends up at the local gym as part of a personal training offering.