I use this mainly for stretching but what I’ll say applies to the entire app: The app is fine and offers a variety of exercises even at the free tier. That said, there are three major flaws in the way the exercises are presented. 1. You can’t turn off the music! It will only me muted if you are already playing music on the device. I like to listen to music elsewhere so this just makes a mess, especially considering I want to hear the app’s audio feedback. 2. Speaking of feedback: the app does not offer much. The biggest problem is it doesn’t let you know when the exercise period is over! When you’re doing some of these exercises you can look at the phone so you just have to wing it... This takes your focus away from the workout. 3. The exercise preview is of fixed length and is simply the opening seconds of the proper video. Many times this is not enough to see the whole requirements which means you are often surprised with unexpected positions.