Develop a Mac Application

We are looking to create an app for Stepz Interactive so we can display the fitness exercises on the portal on 3 different screens. I would like to develop a program whereby we can display exercise videos on a loop for group-training. These exercise videos would be used to demonstrate what to do at each station around the gym. Ideally, I would like to be able to display up to 8 exercises on each of our three smart TV’s. This would allow us to have 24 stations which is a great start. I have attached an illustration to help you understand what I would like to achieve. [login to view URL] As well as the TV’s displaying the exercises which correspond to their respective ‘workout station’ I would like to have a timer in the middle of the screen which displays the time intervals of each station. We could start with 45 seconds of ‘GO’ and 15 seconds ‘REST’.