Treadmills are iconic pieces of exercise equipment for the wrong reason. They’re famous  primarily for sitting unused in basements and spare bedrooms all across the country. These treadmills go unused despite having some pretty sophisticated features, including embedded video trainers who talk to you during your workout, realistic imagery of running routes, automated speed and incline adjustment to match the imagery you’re seeing, and even a “cruise control for your heart” that monitors your heart’s beats per minute and adjusts the difficulty of your run in real-time to keep you in your target heart-rate zone throughout your workout. However, all…