Getting Rewards
Rewards are a benefit of gym membership; if your gym has partnered with a company to provide you with health & fitness discounts, you will see a Rewards option in the sidebar, and possibly on the shortcut bar at the bottom of the app if your gym has enabled it.
As you can see from the animation above, pressing Rewards takes you to your gym's rewards provider. The exact site/company may vary from gym to gym, but you will be given access to a range of discounts and other offers on a wide range of fitness products; nutrition, sportswear, gym equipment etc.
The exact Ts&Cs of your specific rewards programme will be available at your gym and/or via the rewards provider.