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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. Once you get as high as you can, bring your body back down, so that your feet return to their horizontal starting position. Do this stretch for 3 sets of 15 repetitions daily. This movement should be slow and controlled. You get a much better stretch that way and you minimize the risk of increasing the injury to your Achilles tendon. You can use a short step, like those used for step aerobics class, or a normal step in your home. In order to stretch your Achilles and calves in a slightly different way, repeat the heel drop but bend your knees slightly while you do it. Bend your knees before you start raising your body up. Doing these stretches daily will strengthen the tendon, making it able to better withstand the stresses that are put on it when you do daily or athletic activities. Once you have done the double leg heel drops and you feel that your Achilles tendon is getting stronger, you can begin to do heel drops that put your whole body weight on just one leg. Do the straight leg and bent knee leg drops as you did before, just balance on one leg as you lower your body back down, with the other one slightly lifted off the step. It is a good idea to have a wall or railing to balance on when doing these drops. It takes more effort to balance on only one foot as you move your body down for this stretch. Do this stretch daily to increase the strength of your Achilles tendon/
Do heel drops with straight legs. Drop your heels with bent knees. Try single leg heel drops.