To collect data on a person, pods must be paired to them before starting activities.
To pair pods to a person, click on the menu next to their name and select pair pods. Then, select a left and right pod from the dropdown menus and click PAIR.
You can also pair pods that are currently docked by clicking on the dock icon next Pods in the sidebar, selecting the pods you want to pair, and then selecting the person you want to pair them to.