Does exactly what it advertises. The background must be clear and plain as possible. This is clearly spelled out in the instructions so I am in no way criticizing the app but rather reinforcing the need for an uncluttered background. The first round of snatches I did, I must not have had the camera positioned well. I’ll try to explain as best I can. The wooden rafters in the ceiling were in view of the camera when I started snatching and at the apex of the snatch, the bell sort of blended in with the ceiling rafters from the camera’s point of view. It started counting extra reps even though I wasn’t moving. I moved to a different spot and positioned my phone ensuring the camera saw only me, the bell, and a white wall behind me. Once I did that, it counted flawlessly!!!!! Again, not a criticism…more of a caution. The only thing I’d love to see is the ability to see data afterwards detailing how many reps were performed in each one minute interval so I can get a better idea of performance throughout the set when coach prescribes max pace sets. Four out of five stars only because I do feel it’s a bit pricey and there’s room for improvement as mentioned above. Well done!!!!