[BUSINESS IDEA] Muscular exercise

Hello guys,

I find that jogging has much more followers now due to the existence of apps that monitor what we run (how many kilometers, where we ran, calories burned and so on). I don't think muscular exercise has anything like this yet, at least nothing that automatically tracks exercise like how many push-ups and sit-ups were done for instance.

To answer this, I thought about making a smart exercise mat that could track most of the bodyweight exercise. I explain it better in the following launching page:

http://activit.launchrock.com/

I'd love to get some constructive feedback and see if I should aim for this. Do you guys have this problem? Do you see yourselves buying something like this? What do you like more about the idea? What do you like least?