Interesting..if you mean physical shape, then I always thought that the most effective way to "get in shape" is a simple discipline combined with the primitive reward-system..Literally - just don't eat junk food, work out for 30 minutes per day and if you are happy about results, go ahead and reward yourself by a piece of apple cake or whatever(reduce your normal intake to keep everything balanced - for advanced users). This is so simple and so effective that you don't need anything else - no trackers, no complex data analysis or shrink visits. Amazingly a lot of people ignore this simple path and try various tools like this "exist" thingie.