EZ-Bar Preacher Curl
TL;DR
The EZ-Bar Preacher Curl is a strict isolation exercise targeting the Biceps Brachii (Short Head) and Brachialis. By locking the arms against a pad in partial flexion, it eliminates momentum and enforces an ascending-descending resistance curve, maximizing mechanical tension at the mid-point of the curl.
Biomechanics Profile
Programming Parameters
Execution Protocol
- Setup & Alignment Adjust the preacher pad so it sits securely nestled in your axilla (armpit) with your chest pressed firmly against the support. Grasp the EZ-Bar with an underhand, shoulder-width grip on the semi-supinated cambers. Plant your feet firmly into the floor, brace your core, and retract your scapulae to create a stable shoulder girdle.
- The Descent (Eccentric Phase) Lower the bar in a slow, highly controlled motion (3-4 seconds) while inhaling deeply. Maintain constant tension and stop just shy of a full elbow lockout. Keeping a 5 to 10-degree bend at the bottom protects the distal biceps tendon from excessive sheer force while maximizing mechanical stretch.
- The Curl (Concentric Phase) Flex your elbows to drive the bar upward while exhaling. Squeeze the biceps intensely at the peak of the contraction. Stop the movement just before your forearms reach a completely vertical position; going past vertical allows gravity to pull the weight straight down through the joint, removing tension from the biceps.
Clinical Red Flags
- Hyperextending the Elbows: Relaxing the tension at the bottom of the movement and letting the elbows lock out completely places massive sheer stress directly on the distal bicep tendon, significantly increasing the risk of a rupture.
- Shoulder Elevation & Protraction: Lifting your elbows off the pad or rolling your shoulders forward during the concentric phase shifts the mechanical load to the anterior deltoids, destroying the isolation required for optimal bicep hypertrophy.
Clinical Troubleshooting
Biomechanically Similar Alternatives
Frequently Asked Questions
Why use an EZ-Bar instead of a straight bar for preacher curls?
The cambered grips of an EZ-bar place the wrists in a semi-supinated position. This drastically reduces torque and valgus stress on the radioulnar and elbow joints while still eliciting high electromyographic activity in the biceps brachii and brachialis.
Does the preacher curl target the short or long head of the bicep?
Because the shoulders are fixed in a state of partial shoulder flexion on the pad, the long head of the biceps is placed in a position of active insufficiency. This shifts the primary mechanical load and hypertrophic stimulus onto the short head of the biceps brachii and the underlying brachialis.
How low should I lower the bar during the eccentric phase?
You should lower the bar until your elbows are nearly fully extended, leaving a slight 5 to 10-degree bend. Achieving full mechanical lockout at the bottom under heavy load drastically increases the risk of distal biceps tendon avulsion or tearing.
Evidence-Based Citations
- Marcolin, G., Panizzolo, F. A., Petrone, N., Moro, T., Grigoletto, D., Piccolo, D., & Gargiulo, P. (2018). Differences in electromyographic activity of biceps brachii and brachioradialis while performing three variants of curl. PeerJ, 6, e5165. [Marcolin et al., 2018]
- Schwarz, N. A., Harper, S. P., Waldhelm, A., McKinley-Barnard, S. K., Holden, S. L., & Kovaleski, J. E. (2019). A comparison of machine versus free-weight preacher curls on biceps brachii electromyography and isometric torque. Journal of Strength and Conditioning Research, 33(4), 882-889. [Schwarz et al., 2019]