An idea I would love to see in this app is when making a workout plan having a diagram of a body in the anatomical position and having the diagram light up in different colours. For example a leg day split would have all the legs light up.
Something that would make it stand out is using colour to indicate if you’re planning on over working a muscle (red). Not training at all (grey). Perfect level (green).
Having a gradient and in your bevel style would still make it minimalist but show a great level of more helpful information