Q: Step Competitions on Apple Watch

Hi

I believe the app featured in the ad is: Argus - Calorie Counter & Activity Tracker for Heart Healthy Diet & Living

• "CHALLENGES – invite friends and family with challenges to motivate each other in a fun way"
• Website: http://www.azumio.com/s/argus/index.html
• App: https://itunes.apple.com/us/app/argus-calorie-counter-activity/id624329444?mt=8

You can also create your own challenges using the apps Matchup and Activity Club. Both of them are quite nice.