Gear: Heart rate monitors, vital sign trackers keep you in the know during workout

Whether you're 18 or 80, if you like to run, bike, row, swim, cross-country ski or climb mountains, you have to keep an eye on the old ticker — for training and safety purposes. Those aiming for victory have to know how hard to push it; those out for basic health and longevity have to know when to throttle back. And those who take it too far absolutely have to get help fast. Here's some technology that provides instant access to your vital signs exactly when you and your helpers need it.

Roy Wallack

February 7, 2011