Isolating strength exercise for biceps.
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Grip the dumbbells and let them hang by the side. Stand hip-wide with your feet and tense your body.
Pull up the weight by bending on the elbows. The upper arms should be completely still in front of the body.
Turn back down in a controlled manner when you reach chest height. Stop just before the arms are fully stretched, so you have a slight tension in the muscles and repeat the exercise again.