I love Gymaholic, but I don't understand how the AR is useful at all. How is it better for me to watch a 3D model do an exercise with my couch as the background, rather than just a black background? Is it the ability to walk around the 3D model? It's much easier just to spin the model with my thumb.

That is how I feel about most AR is in general. It just filters out the app background and makes whatever your camera is pointing at the background.. without really adding any value.

I'm sure AR will have some absolutely amazing applications in the future. I just haven't seen much of it yet.