Above: The Nike Fuelband is the subject of a UK softball players study on how well it measures expended effort.
Left: Fitbit is a popular fitness gadget; on some treadmills it offers an interface so users can customize their workouts.
Above: The Nike Fuelband is the subject of a UK softball players study on how well it measures expended effort. Left: Fitbit is a popular fitness gadget; on some treadmills it offers an interface so users can customize their workouts.
Above: The Nike Fuelband is the subject of a UK softball players study on how well it measures expended effort. Left: Fitbit is a popular fitness gadget; on some treadmills it offers an interface so users can customize their workouts.

Health & Medicine

February 26, 2013 12:00 AM

When measuring your heart rate during exercise, a gadget isn't always necessary

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