Interesting project with some potential. I suggest not using pie charts at the bottom though, because there are too many data points. I think "boring" bar charts would be the better choice.
By all means do that, but in the long run it is not enough. 8 hours of sitting isn't countered by walking for 1 hour. There are many good exercises you can do with little to no equipment, the recommended routine of /r/bodyweightfitness is a good place to start https://www.reddit.com/r/bodyweightfitness/wiki/kb/recommend...