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They vary depending on what's happening. Fitbit say:
Blaze has three buttons: Action, Select, and Back.
Use the Back button to return to the previous screen. The behavior of the Action and Select buttons depends on the screen, but usually these buttons are an alternative to tapping. For example, during an exercise you can tap the pause icon in the lower right or tap the Select button next to it instead.
taken from: http://help.fitbit.com/articles/en_US/Help_article/2086#buttons
Fitbit Product Experts Alumni are retired members of the Fitbit Product Expert Program. Learn more
They vary depending on what's happening. Fitbit say:
Blaze has three buttons: Action, Select, and Back.
Use the Back button to return to the previous screen. The behavior of the Action and Select buttons depends on the screen, but usually these buttons are an alternative to tapping. For example, during an exercise you can tap the pause icon in the lower right or tap the Select button next to it instead.
taken from: http://help.fitbit.com/articles/en_US/Help_article/2086#buttons