Nothing wrong with the app. Tells you the number to do and give a countdown to the next set. The problem is the same for a bunch of these sit-up apps (and I've tried others): No explanation of what they believe a sit-up is. Just look at the icon for all the sit-up pas and you'll see a different picture of a sit-up in each one. Where should I put my hands? Elbows out or in? How far should I come up? How fast or slow? It's to just this app but most of them. Proper form is important, and also important to avoid injury. It would be nice to know what each of these apps think proper form is. For example: if you have to come all the up and touch elbows to knees (as this app icon shows), then this is a lot harder than say a crunch (like the app icon on "runtastic" app shows) where you simply lift your back off the floor. But that one has no video or illustration either. Frustrating.