Aaptiv allows you to save workouts to make them easer to find later.
To save a workout, tap on the workout to bring up the Workout Details screen. On that screen, tap on the bookmark icon 
. On the modal that pops up, you can choose to save it to an existing list, or create a new list.
To remove a workout from a saved list, follow these same steps, and when the modal pops up on the Workout Details screen, select the list you want to remove the workout from.
To find your saved workouts, tap on your avatar in the upper left-hand corner of the screen to open the side bar. From there tap on Saved workouts to see your saved workouts lists.