Donkey Calf Raise

Execution
1. Place your toes on a block, lean forward while supporting your torso on the bench, and lower your heels as far as possible.
2. Lift the weight by raising your heels up as high as you can, keeping your legs straight.
3. Slowly lower your heels down to the start position.
http://www.youtube.com/watch?v=Awm54Y0dIZo
Muscles Involved
Primary: Gastrocnemius.
Secondary: Soleus.
Anatomic Focus
Foot position: Pointing your toes straight ahead (a) targets the whole gastrocnemius muscle. Pointing your toes out (b) emphasizes the inner (medial) head, whereas pointing your toes inward (c) targets the outer (lateral) head.

Foot spacing: Positioning your feet hip-width apart targets the whole gastrocnemius muscle. A wide stance emphasizes the inner (medial) head, whereas a narrow stance targets the outer (lateral) head.
Body position: Keep your spine straight and torso parallel to the floor. Keeping your knees fully straight helps isolate the gastrocnemius. A slight bend at the knees allows the soleus to contribute to the movement.
Range of motion: To maximize the range of motion, aim for a full stretch at the bottom and full squeeze at the top.
Resistance: Have a training partner straddle your hips, as shown in the illustration, so that his or her body weight provides resistance.
VARIATION
Machine donkey calf raise: You can perform this exercise while using a machine where the weight is transmitted through a pad resting across your lower back.