TUNNEL TAIL! Completely free, no IAP and a true hidden gem. https://itunes.apple.com/de/app/tunnel-tail/id542027702?mt=8 Also: Survival Run With Bear Grylls: https://itunes.apple.com/de/app/survival-run-with-bear-grylls/id503421893?mt=8 Do you have that on your radar, Mr Runner-Lover-Exact-Psience?
