You’ve just started eating healthy and doing regular exercises. However, you haven’t had a way to track your progress and the cycles you’ve going through.
Fitness trackers are there to help you stick to a diet or exercise plan.
If you’ve resolved to get more exercise, get more sleep, or lose weight, then a host of wearable electronic devices and apps are available to help you succeed. 
niood lists you the Best Fitness Trackers for Your Healthy Lifestyle:

2. Withings Pulse HR