Fitbit Coach (formerly Fitstar) was a video-based bodyweight workout app that used AI to personalize workouts based on user feedback. Launched July 1, 2013; shut down July 30, 2021 — it lived 8 years. One of 32 Google products killed in 2021. https://help.fitbit.com/articles/en_US/Help_article/2279.htm Data: Killed by Google (killedbygoogle.com, MIT).