A team has now developed a instrument called shape scale 3D scanner.
Basically it looks like a weighing scale, all you need to do is stand upon it and it will scan your body completely from all the sides and prepare a 3D picture of your body. It’ll be saved in the device itself.
After one week or 10 days of workout, you can again take a 3D scan of your body. The device will compare it with the old scanned image and will tell you what improvements you have done with your body shape.