Task: I had completed the first-day workout and felt it was too Hard. Customize the training rest time by 5 more sec in the Home Workout app.
Steps:
Go back to the previous page
Click on the settings icon 
Click on the workout settings 
Click on the training rest
Click to increase the time
Click to increase the time
Click to increase the time
Click to increase the time
Click to increase the time
Click on the set button