1. For a period of 2-4 weeks train your calves on a daily basis before returning to your normal program. Use about 4-6 sets per workout, using a different exercise each day.
2. Every night before you go to bed do a set of 100 slow, hard-squeezing standing calf raises with just your bodyweight, on top of your normal program. Go for maximum burn.
3. Every time you encounter a staircase do a calf raise up each step. On the way down, step onto the ball of your foot, as this will act almost like a plyometric movement for your calves.
4. Do like Arnold did and train calves in your bare feet (if your feet can handle it). This will increase the range of motion for any calf movement, and will force a very intense contraction.
5. Eat healthy foods that are part of a balanced diet. Building bigger muscles, no matter what part of the body you're targeting, requires fueling yourself with a balanced diet. Make sure you are getting your daily recommended amounts of protein, fat, and carbohydrates, and providing your body with fresh fruits and vegetables.
Avoid eating calories in the form of saturated fats and sugars. Don't eat a lot of fried foods, snack foods, fast foods, and desserts. Avoid white flour and sugar. Foods containing these will make you feel run down instead of energized.