MyHealth - Android - Google Fit, what is it?

With Google Fit, you can measure, track, and store your fitness information on your mobile devices and smartwatches. 

• Set goals around personal fitness
• Automatically measure how close you are to reaching those goals
• See what kinds of activities you perform daily and how long you do them
• Compare your activity over time to see how you’ve improved
• Keep and view data from other fitness apps you’ve connected to Google Fit

You’ll need a mobile device and a Google account to get started with Fit. 

Apple Source: https://support.google.com/fit/answer/6075067?hl=en&ref_topic=6090404#

Connecting MyHealth with Fit enables you to export or import activity, sleep, weight, heart rate and blood pressure.

To activate the link with Google Fit, please read this article: MyHealth - Android - Is MyHealth compatible with Google Fit?