Stand upright holding a barbell with an underhand grip at shoulder width. Keep your chest up and arms extended. Pull your elbows backward while dragging the barbell up along your torso, keeping it very close to your body. Lift until the bar reaches lower chest height, then squeeze your biceps. Slowly lower the bar back down along the same path in a controlled motion. Keep your torso still and avoid letting your elbows move forward.
Log your barbell drag curl sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.