Ankle Plantar Flexion & Squats. Part of the series: LS - Muscle Workout Tips. When you squat with your ankle in a plantar flex position, your heels are elevated, which may allow you a fuller range of motion and to more safely perform a squat. Find out about ankle plantar flexion and squats with help from the only physician in the country to hold board certification in Obesity Medicine and be certified by the American College of Sports Medicine as a Clinical Exercise Specialist in this free video clip.