If, like me, you were blessed with nonexistent calf muscles, try the following exercise. Bear in mind that the calf muscle is probably the most difficult muscle in the body to build, but you can at least improve its tone.

Calf Raises on a Step
Start Position:
Stand with the ball of your left foot on the edge of a step. Wrap your right foot around the left leg. Hold a dumbbell in your left hand. Allow your heel to drop down.
Exercise:
Lift your heel up by tensing your calf muscle, then relax and allow it to go back to the starting position. Repeat 15 to 20 times. If you can't complete at least 15 repetitions, try a lighter dumbbell or no dumbbell at all. If you find you can do more than 20 repetitions with ease, use a heavier dumbbell.