So, it turns out you can use your iphone for more than Instagram-ing pictures of your dog, and checking your Facebook status. It can actually be a pretty amazing training tool while you are churning out the miles on the trainer. We carry products from Wahoo Fitness and Kurt that allow you to track everything from heart rate and cadence, to power. There are a bunch of free apps like Strava, that will track all of your info. And now that Strava is linked up to Instagram, you can still take pictures of your dog, from the trainer.