Stand upright and grip the Smith machine bar with an underhand grip at shoulder width. Starting with the bar at thigh level, curl it upward by pulling your elbows back and keeping the bar close to your torso. Squeeze your biceps at the top, then lower the bar with control while maintaining tension through your arms and core.
Log your smith drag curl sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.