Strava - The #1 app for runners and cyclists
Bkool Simulator - Bkool Simulator app comes up with features to help users in competing with thousands of cyclists from around the globe in real-time.
BitGym - Virtual Cardio Tours. No heart rate sensor of special hardware required.
VDOT Running Calculator - VDOT Running Calculator app lets you measure your running ability so you can share results with your friends as well as can compare results with other training programs.
iFit – Workouts at Home - iFit – Workouts at Home app allows users to access an extensive collection of thousands of home workouts with advice and motivation from world-class fitness trainers.
fitbit - The Fitbit mobile app is for people who use Fitbit fitness trackers to keep track of their activity goals, food plans, and other fitness related things. Read more about fitbit.