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Georgijevic / GettyIf you’ve ever worked with a personal trainer, you might get the impression that one of the main qualifications is the ability to count to 10—as in counting your reps as you sweat through those biceps curls. Then, after realizing you also can count to 10—and after spending so much time at the gym...

filadendron / GettyYour fitness tracker may be failing you if it doesn’t have this one key sensor that could help monitor stress, recovery, and workout readiness: a heart rate variability (HRV) monitor. Don’t get this confused with your heart rate; it’s different. Heart rate (HR) monitors measure your beats per minute—a standard measure of exertion, which...