Here's some feedback from someone who actually used your app to work out.
1. On my iPad in horizontal orientation, I had to scroll up and down to see the exercise name and the timer, it was --really-- unintuitive.
2. I want to tap the X Minutes button and have the exercises run one after the other. Having to get up and press the "Start" button for every exercise is really counterproductive.
3. The gifs are really lacking in explanations of certain exercises. Can you use actual videos instead low framerate gifs?
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Otherwise this is excellent. I'll start doing 10 minute sessions in the morning and at night. Hopefully in a month I'll have lost this weight.