How to do a preacher curl with an underhand grip. Keep your posture upright, elbows in front of your torso, and move smoothly through the full range of motion. Use light enough weight to stay in control the whole time.
Preacher curl, up nice and tall, bring your lats down into your armpits. Control always very smoothly, no jerky movements. Up nice and tall and squeeze. Keep your head straight. Make sure you use a light enough weight where you can control the movement at all times. Keeping up tall, make sure the elbows are always in front of your body. This is preacher curl with a supinated grip.
