This would be great in an ideal world, however, the reason for TV channels to have commercials is to create revenue so that they can still be able to provide their service. In this scenario, who or what will replace this cash flow?
Yes, I agree with this idea, however, there is a lot of fitness/health/nutrition apps already existing. I like your highlighted education feature, which I think is important in regards to "promoting" good health. Examples may include apps that works as a database for the user, rather than working as a personal trainer with a high focus on weight management and loss.