Blow into the headset to ride the bike down the hill.Breathing games are based on a breathing technique called Pursed Lip Breathing and they are designed to train kids to make exhalations longer. This is especially recommended for people with breathing related (asthma, emphysema, COPD) and stress related (anxiety, blood pressure) disorders. In general, medical doctors encourage people to perform Pursed Lip Breathing in order to get more oxygen, to gain more energy or to relax.WARNING: This application is designed to work best with BREATHING+ headset. Using your mobile device's built-in microphone may result in damages not covered by your warranty. Additionally, BREATHING+ headset provides hands-free operation, firm position in front of your mouth and a much better signal-to-noise ratio resulting in more accurate breathing detection. For optimal performance and to ensure protection of your mobile device, buy BREATHING+ headset: http://www.breathinglabs.com/breathing-package/Be sure to check other games from our collection of Breathing Games!