Exercise
The bicep curl is an isolation exercise targeting the biceps brachii (biceps). It is the most popular arm exercise, performed with a barbell, dumbbells, cables or resistance bands. Although the biceps is a relatively small muscle, it is visually important and often becomes a training priority.
🎯 Primary Muscles
Biceps brachii, brachialis.
🔧 Secondary Muscles
Forearm flexors (brachioradialis), anterior deltoid.
⚡ Exercise Type
Isolation exercise. Single-joint — only the elbow joint works.
📊 Difficulty Level
Easy. One of the first exercises beginners learn.
📋 Proper Technique
1
Starting stance: Stand upright with feet shoulder-width apart. Grip the barbell/dumbbells with palms facing forward (supinated grip).
2
Arm position: Arms fully extended, elbows tucked to the sides. They must remain fixed throughout the exercise.
3
Lifting: Slowly lift the weight by bending your elbows. Only the forearms move — the upper arms and elbows stay in place.
4
Top Position: Fully bend your elbows until the weight reaches shoulder height. Briefly squeeze the biceps (0.5–1 sec.).
5
Lowering: Lower the weight back under control — lowering should take longer than lifting.
6
Breathing: Exhale while lifting, inhale while lowering. Do not use body momentum.
💪 Muscles
| Muscle Group | Muscle | Role |
|---|---|---|
| Upper arm (front) | Biceps brachii (long and short heads) | Primary — elbow flexion and forearm supination |
| Upper arm (deeper) | Brachialis | Elbow flexion — especially with a neutral grip |
| Forearm | Brachioradialis | Assists elbow flexion |
| Shoulders | Anterior deltoid | Helps minimally if body momentum is used |
⚠️ Mistakes
- Body swinging: Torso momentum is used — "cheat curls". Solution: reduce the weight, press your back against the wall.
- Elbow movement: Elbows move away from the sides or move forward and back. They must remain fixed.
- Lowering too fast: The weight drops down. The eccentric phase should be slow (2–3 sec.).
- Incomplete Range of Motion: Arms are not fully extended at the bottom. Full extension is necessary.
- Too much weight: Forces you to use body momentum. The biceps is a small muscle; it does not need heavy weights.
🔄 Variations
| Variation | Description | Difficulty |
|---|---|---|
| Barbell curl | Classic variation — allows use of the greatest weight. | Lightweight |
| Dumbbell (alternate) | Alternating with dumbbells. Corrects muscle imbalance. | Lightweight |
| Hammer curl | Palms facing each other (neutral grip). Focus on the brachialis. | Lightweight |
| Concentration curl | Seated, the elbow rests on the thigh. Maximum isolation. | Intermediate |
| Preacher curl | On an inclined bench — elbows fixed, no cheating. | Intermediate |
| Incline curl | Lying on an incline bench — greater range of motion, stretches the biceps. | Intermediate |