Jack Forrester on Instagram: "If you’re interesting in changing your body composition, a solid starting point is to start tracking trends not absolutes. Most of us will never need to know the difference between 3-4% body fat but we do want to know if we are making forward progress or not. Get a baseline set of numbers that you can consistently track and measure. The way you eat, live and train will then dictate whether or not they are moving in the right direction. Your simple measuring system t