Stand facing a cable machine with a single handle attached to a high pulley. Grasp the handle with one hand using an overhand grip, keep your elbow close to your side, and step back slightly to create tension. Extend your arm downward by straightening the elbow until the handle reaches your thigh, then return slowly to the start. Maintain a controlled tempo and stable torso throughout to keep the emphasis on the triceps.
Log your cable one arm side triceps pushdown sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.