Trackers are unique units used to measure a specific activity. For example, steps are entered using the "Walking" tracker. 

Trackers like Swimming, Weightlifting, and Yoga are focused on physical activity, whereas some trackers are focused on different areas of wellness, such as Brain Teaser, Eat Clean, and Sleep.

Trackers can be tied to specific challenges but they are always available throughout your program to help keep a record of completed wellness activities within the calendar feature.