A wearable device or a computer application that records a person’s daily physical activity, together with other data relating to their fitness or health, such as the number of calories burned, heart rate, etc.
I get five miles of walking in a day according to my fitness tracker
online fitness trackers can be used to track stats and compare with others
Definition of fitness tracker in US English:
fitness tracker
noun
A wearable device or a computer application that records a person’s daily physical activity, together with other data relating to their fitness or health, such as the number of calories burned, heart rate, etc.
I get five miles of walking in a day according to my fitness tracker
online fitness trackers can be used to track stats and compare with others