MyFit Mod 1.8, 1.7.10, 1.7.2 allows you enhance performance through statistics. The more times you do something, the better you get at it, giving you better buffs. However, the only way to receive these benefits is to craft and wear the MyFit.

To wear the MyFi, press M (you can change it in controls) and it will open up the MyFit menu. Put your MyFit in the slot labeled "MyFit". Once you have the MyFit on, it will start tracking your stats. The more you walk/sprint. the more speed you will get.