Abstract: An arm locking device for weightlifters is worn when performing weightlifting exercises primarily for the biceps to eliminate cheating by keeping the elbows close to the body. The arm locking device includes an elongated flexible and foldable axially stiff continuous strap having a central region for resting on the chest of the weightlifter and right and left end portions for wrapping around the biceps regions of the weightlifter's left and right arms. An adjustable neck strap assists holding the central portion of the strap on the chest during use. Opposite left and right end portions of the strap extend behind the triceps and the over the biceps regions of the left and right arms, respectively. Frictional fasteners on the free ends of the straps are then fastened to cooperating frictional fasteners on the central portion of the strap which overlies the chest region of the weightlifter. The ends of the straps are fastened tightly to lock the arms close to the body.