Fitness Equipment, Wearables, and Apps - Compatibility
Physical activity can be recorded, stored, and portrayed via a collection of devices. There are wearable devices - worn on wrist, around waste, around chest. etc. - than can measure your movements (or lack of), heart rate, sleeping patterns, changes in altitude (stairs climbed), body temperature, breathing rates, and other fitness related metrics.
Fitness equipment can also measure activity like a wearable and often provide much more accurate measurement - and then submit the information to the same smartphone app or computer software.