Price: Free (basic features)
Size of the update on iPhone: 49.5 MB
Runkeeper is an app for keeping track of your fitness activities like running, walking, cycling. Home page of Runkeeper here.
On Google Play this application has over 370,00 reviews giving average of 4.5 (out of 5).
Added Weekly Frequency Goal and Community and Friends Challenges information (view the history, invite friends to join, and also see how many runners joined the challenge).