Isolated Barbell Curl

Starting position

1. Sit at the preacher bench and set the seat so your armpits rest snugly on the top edge of the pad.
2. Lay the backs of your upper arms on the angled pad, elbows shoulder-width apart.
3. Take the bar with an underhand, shoulder-width grip — an EZ bar is more comfortable. Usually it rests on the bench hooks or a partner hands it to you.

Execution

1. Start with arms almost straight, without fully hanging on the elbow joint.
2. Exhale and curl the bar toward your shoulders. Your upper arms stay on the pad.
3. Stop when your forearms are close to vertical — past that point the biceps lose tension.
4. Inhale and lower the bar slowly, over 2–3 seconds, without snapping your elbows straight.

Common mistakes

• Dropping the bar and bouncing at the bottom — with straight arms the elbow and biceps tendon are at their most vulnerable.
• Lifting the elbows or upper arms off the pad — the shoulders and torso join in and the isolation is lost.
• Seat too high or too low — the arms sit unstably and the elbows slide.
• Too much weight — you can't control it at the bottom.

Beginner tips

• Start with an empty EZ bar and add 1–2.5 kg at a time.
• Move especially slowly through the bottom part of the rep.
• If your elbows feel uncomfortable, reduce the weight and stop just short of full extension.

Alternatives

• Dumbbell Concentration Curl — similar isolation with a dumbbell
• Incline Dumbbell Biceps Curl — each arm works independently
• Standing Cable Biceps Curl — easier to control the weight