The Brutal Truth About the Ez Curl Bar Preacher Curl: Muscle Builder or Joint Hazard?
By Alexander Ross
Loading an ordinary straight barbell onto a preacher bench frequently sparks acute discomfort along the medial wrists and inner forearms. A straight bar forces the wrists into complete supination, palms turned flat toward the ceiling, while the forearms press flat against an angled platform. For individuals lacking excessive carrying angles or carrying tight ulnar structures, this creates immense wrist tendon strain.
The EZ curl bar solves this anatomical friction through its undulated design. By offering a subtle 30-to-45-degree cambered bar angle, the bar accommodates a natural semi-supinated grip. This positioning preserves the health of the carpal tunnel and distributes rotational torque evenly across the radius and ulna.
Biomechanics involves tradeoffs. Pure supination yields maximum activation of the biceps brachii, which functions as a forearm supinator alongside its role as an elbow flexor. Tilting the hand into a semi-supinated stance slightly reduces biceps peak contraction, transferring a portion of the workload onto the brachioradialis and deeper brachialis. Most strength coaches consider this trade essential: sacrificing roughly 5% to 8% of peak bicep recruitment is well worth protecting the wrists and elbows over decades of lifting.
Alexander Ross has covered the video game industry for a decade, writing deep dives on game design, esports tournaments, VR developments, and gaming culture.
