[header] How to stretch for achilles tendonitis [title] Do heel drops with straight legs. [step] Stand on the edge of a step. Position yourself so that the balls of your feet are on the edge of the step and your heels are floating in air but parallel to your toes. 
Keeping your legs straight, but without your knees being locked, flex your ankle and feet slowly so your whole body lifts up. [substeps] Once you get as high as you can, bring your body back down, so that your feet return to their horizontal starting position.