Want to know just how hard you're exercising? Maybe your TV can tell you. At least it can if you've equipped yourself with the new Entertrainer from PowerUp Fitness Inc. The Entertrainer turns your TV into an exercise intensity monitor by combining the functions of a universal remote control and a heart rate monitor. You program the Entertrainer with your age, gender and desired workout intensity and hang it from your exercise machine. Then strap a heart-rate monitor around your chest, turn on the TV, and begin your desired method of aerobic torture ó treadmill, stationary bike, stair climber or rowing machine. As long as the user's heart rate stays within the zone programmed into the Entertrainer, the TV will keep broadcasting your favorite show loud and clear. But start to slack off, even a little bit, and the volume will drop. Slack off long enough and the TV will shut off, leaving you winded and with nothing to watch. Joe Volpe, who invented the device, says it's constructed mostly from off-the-shelf electronics. The most distinctive thing about its mechanical design is that he packaged the electronics in a do-decahedron plastic shell. "I saw the shape on a Star Trek episode and thought it looked cool," he says. For more information on the Entertrainer, visit http://rbi.ims.ca/4915-530.