If you want to end a plan before completion, or if you want to switch to a different plan before completing the one you are currently following, you can do so by tapping the three dots in the top right of the My Plan screen. If you have completed one or more workouts for the plan, your progress will be saved and the plan will be marked as completed. You will not lose any completed workouts in your stats and feed.

It's not possible to pause a plan, however, when you are ready to resume a plan that you did not complete, you can follow that plan again and skip to the week where you wish to start the planned workouts.