Trained runner (IMAGE) University of California - San Diego Caption Videos reveal the clumsy movements of a mouse running on a wheel on the first day of exercise and skilled running after a week of self-training. Credit Spitzer Lab, UC San Diego Usage Restrictions Must be used in conjunction with Li/Spitzer paper on neurotransmitter switching and exercise. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.