Easy to configure and use, the app syncs to a bike trainer like the one from Wahoo Fitness called the Kickr Snap that costs $ 600. (inc.com)
Because the app automatically adjusts the bike trainer depending on the incline, you feel like you're really pedaling up a mountain, and then you get a nice reward when the trainer eases back and you cruise down to the ocean. (inc.com)
I did this about 300 times in my garage with my poor husband acting as the bike trainer. (kneadtocook.com)