[header] How to do the windshield wiper stretch [title] Lie on your back. [step] The basic windshield wiper stretch is done from a supine position (i.e., lying face up) on the floor. Bend your knees so that your feet are resting flat on the floor, and extend your arms straight out to either side. 
[substeps] Check the position of your shoulder blades. Your shoulders should be rolled back, with your shoulder blades flat against the floor.