I found this LYMPO program about 4 months before. This program is available for iOS and Android users. Lympo is a free app that allows you to earn money just for walking or running. Complete walking and running challenges, receive rewards and buy products you love from the in-app marketplace. By completing challenges (from 0,1 km/mile to 50 mile) you gain in-app currency - LYMS. 100 LYMS = 1 USD. In-app market has items such as men and women sport shoes, sport shirts (thermo, dri-fit), electronics (iPad, Fitbit, , iPhone, Beatz, Garmin) and so on.
This App does have very good reviews as well.
By completing challenges you also get useful information about safe running and better performance.
On this program is a leaderboard and you can compare your and your friends weekly performace.
If you join under this link , you will get your challenges rewards boosted for the next 48 hours.