If you’ve considering buying a shiny new Apple Watch Series 2, you might be wondering if it can really help you to get in shape. Especially if you’ve seen the recent headlines claiming that fitness trackers don’t work.

So what does science really have to say about wearables? I decided to investigate the science behind Apple Watch fitness assumptions.

After undergoing successful chemotherapy treatment for cancer, Apple’s fitness gadgets helped me turn my life around and get fit in middle age. So I know from personal experience just how important they can be. That’s why I focus on fitness for Cult of Mac, and it’s why I’ve written The Cult of Mac Fitness Handbook: Get in Shape With iPhone and Apple Watch.

Today, I’m in the best shape of my life, and I rely on my iPhone and Apple Watch to help keep me that way.

They are powerful tools for getting fit and losing weight — if you know how to use them.