Article: Heart-rate monitors help you craft the perfect workout.

Byline: Julie Deardorff

CHICAGO _ The fascination with heart-rate monitors is reaching new heights after the Outdoor Life Network showed the pulse of some riders in the Tour de France in July.

It's like having a cockpit view of an auto racer's instrument panel.

Perennial champ Lance Armstrong didn't volunteer his real-time data; he didn't want competitors to know when he was truly sweating. But his heart-rate numbers, which provide a rare glimpse into his freakishly efficient body, are legendary and telling.

When Armstrong is relaxing off the bike, his resting heart rate, or pulse, has been measured at just 32 beats per minute, less ...

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