If you don't know what bullet journaling is, this is a great overview. TL;DR: A bullet journal is the perfect lovechild between a planner, diary, and to-do list. Plus, it can be really useful for keeping track of your health-related goals in a beautifully organized way.
Here are some ~bujo~ layouts perfect for tracking your exercise, nutrition, sleep, and everything healthy in between.
Quick note: The idea here is to get inspiration for layouts to track your own personal health and fitness goals — not to copy anyone's individual plans. What works for one bullet journalist might not work for you, so definitely consult with a doctor before pursuing any fitness or diet plan.