Alright if all you need is video examples
It does show 59 different exercises and how to perform them. Several apps will give you that for less. The build your own workout feature is promising, but I was expecting there to be some good sample workouts already in the app. It comes with TWO workouts. So be prepared to build your own. If it had more example workouts, the $4 price might be justified. Without more workouts, Id put this in the $2 category.
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Stark Dumbbell