CHIP codes are a way for athlete's to share workouts they created with their friends.

You're able to view and access these codes that you have created or the codes that have been shared with you from a friend - access this menu in 'More Options' (the top right of the app)

You create workouts in 'Workout Builder' and enter your CHIP code within the workout settings

These are different than Challenge Codes that Coaches/Admins use to link workout scores for a series of workouts.