Here's how to select/unselect the games you want to play during your workout.
You can start exercising by starting the preset workout in the Today tab or accessing all exercises on demand in the Exercises tab.
At some point, you may want to see less of some games. In that case:
Go to the Exercises Tab
Tap on the game of your choice
Tap "Remove from my playlist"
From now on:
If you have removed a game from your playlist, Today’s Workout will no longer include it
If you select a specific game in the Exercises tab, the next games will be served in shuffle mode and games that were previously removed from your playlist will no longer be offered.
You can add a game back to your playlist by following the above-mentioned steps (Exercises tab > tap on game > Add to my playlist)