After an update, I lost the shortcut to the game, how do I get it back?

If you don't see the game shortcut on your desktop, right-click on the desktop, select View, and then select Show desktop icons. If there's already a checkmark next to it, uncheck and then recheck it. 

Or, press the Windows key (if on PC) or the Command Key (if on a Mac) and type Smash Your Fitness to open the game.