Preacher curls are an isolation, strength-building, resistance weight training exercise that primarily work out both the brachialis and biceps muscles. The preacher curl involves using a preacher bench, which allows the trainer to sit on a padded seat and perform curls by lifting a barbell off a rack positioned in front of them. The targeted muscle is the brachialis, and because the arms are placed at an angle when engaged in a preacher curl, the exercise works the long head of the biceps brachii muscles more than the short head. Preacher curls are a great exercise to use to grow your biceps, brachialis, and brachioradialis, the three main elbow flexors. They are also effective in building strength, power, and definition in the biceps and forearm muscles. Preacher curls are a single-joint, isolated exercise that targets both the biceps and forearms. They promote proper form, build strength, and enhance bicep definition. Preacher curls are a staple exercise for any strength training program and are a great overall biceps exercise, making them a staple of any lifting program.