Has anyone ever had emg (electromyogram) on their legs? Do they do both?

Depends on symptoms. Whether and EMG and nerve conduction test involves one or both legs depends on your symptoms. If you have symptoms (numbess, tingling, pain, weakness) in both legs/feet, plan on the physician checking both. If you have symptoms in only one leg/foot, there may be no testing required on the other leg/foot, or there may be limited testing done (just for comparison purposes).