LAS VEGAS -- In poker, it's common to see pros covering up to keep from revealing their emotions and tipping their hands. Phil "Unabomber" Laak hides his head in a sweatshirt hood. Phil Hellmuth zips ...
When it comes to exercising, your heart rate is the gold-standard metric to uncover how hard you're pushing. It tells you whether you're working aerobically or anaerobically, how your body is reacting ...
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