Jerry never paid much attention to how much physical activity
he engaged in. However, one day he played basketball
while wearing a small activity tracker called a Zamzee on his
waist. Later, he plugged the device into his computer’s USB
port and uploaded the data captured by the device’s accelerometers
(devices to help determine the speed and distance of
the person wearing the device). Unlike a FitBit (www.fi tbit.com),
a popular pedometer geared to adults, his Zamzee did not tell