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To fully develop your calves, you should do both standing and seated heel raises. Standing raises work the whole calf, but emphasize the gastrocnemius. The seated version targets the soleus, the underlying muscle. Machines are good for this, but you can also do the standing raise with body weight or holding a dumbbell and the seated raise with a weight on your lap. I have observed that step aerobics seem to develop the calves as well.