Set up in a split-squat stance (one foot forward, one back) with the ball of the front foot on a raised surface and the heel slightly off. Stay upright in your torso, then hold the position as you engage your calf muscles—especially the soleus—to support your weight and maintain balance. This isometric hold emphasises lower-leg endurance, ankle musculature control and the deeper calf fibres that help in vertical stability and everyday function.