Hi dfaris!
Open up the Microsoft Health App, go to the hamburger menu on the left, then go to Manage Tiles.
If you scroll down to Exercise, there is a little Pencil icon next to it. Tap on the pencil icon and you can custom the Exercise tile.
Many of the tiles have their own customization options that you can access this way, including setting quick replies for SMS and Phone calls, and setting if tiles can give you a buzz and a notification or if the tile just badges.