I am an active CC user and would like to propose some improvements to the UI of the app. These improvements are based on my regular use of the application and should alleviate some inconveniences I experienced with the UI, otherwise very good.
1. I highly recommend putting the "main menu" buttons either on the top or the left of the screen. I often accidentally click on them during the training session, as I try to modify the count. The buttons are located so close to the count +/- buttons and pressing them accidentally breaks the session, so I have to start a new one. I would simply swap the top "What's the count" status bar area with the "main menu" area, and that would take care of the problem.
2. I would recommend to increase the size of the +/- buttons so that it would be hard to miss the buttons, as I often use my thumb for the count changes. It would work great if the #1 request above is implemented.