Update workout program start date

Open the On-demand workout library

Tap Explore from the bottom left corner of your screen. Make sure Workouts is selected from the top menu.
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Select your active program

This will be the program with Active tagged in the top left corner.
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Update your schedule

Hit the Update schedule at the bottom of the screen.
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Choose your new start date

Select the date you want to begin and tap Add to Schedule.
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