Muscle outlines from Body Muscles by Ivan Vulović, Apache 2.0 — regrouped and recoloured for Muscle Train.
Set up for the one-leg seated calf raise by loading up the machine with the weight you want to use. Sit on the machine with the padding on top of your working thigh and the ball of your foot on the edge of the foot pad. Take the weight off the rack by pushing up with your working leg and let your heel drop as far as possible. This is the starting position for the exercise. Slowly push your heel up as far as possible. Squeeze the calf muscle, and then slowly lower the weight back down to the starting position. Do not pause, and raise straight back up again. Repeat for desired reps, and then repeat for your opposite leg.
As a general rule, always train the weakest side of the body first. In most cases this will be the left. Use the biggest range of motion possible, heels up high, and stretch down low. Hold the top of the movement (heels up) for a count of 2-3 to add intensity.
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