Looking for a new way to improve your running, swimming, and biking? Try strengthening your core. You can find some great ideas in this video! http://www.youtube.com/watch?v=4aNq5v695T0Looking for a new way to improve your running, swimming, and biking? Try strengthening your core. You can find some great ideas in this video! http://www.youtube.com/watch?v=4aNq5v695T0