The app that rewards you for walking! Sweatcoin
SweatCoin is a iOS, Android and WatchOS app that rewards you 'sweatcoins' for walking. You can then trade the coins for rewards like a amazon giftcards, Gruum razor kits, running tops, and other stuff.
The current exchange rate is 1000 steps = 0.95 coin
UPDATE* I managed to get a £5 Amazon giftcard for only s3! I just had to test a new update beta.