Curl is an arm exercise performed by standing and holding a barbell with your palms facing up.
To perform it:
1. Start with the barbell resting against your thighs and your arms almost straight.
2. Curl the bar upward towards your chest by bending your elbows, keeping your upper arms glued to your sides.
3. Squeeze your biceps at the top.
4. Slowly lower the bar back down to the start position.
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