This is an excellent exercise for your traps, and I like it very much because I don´t need a heavy weight to feel the burn.
Stand up straight with your feet at shoulder width as you hold a barbell with both hands behind your back with palms facing back. Your hands should be a little wider than shoulder width apart.
Exhale as you raise your shoulders up as far as you can go. Hold there for a second.
Inhale and return to the starting position.
NOTICE: Do not lift the barbell by using your biceps. The arms should remain stretched out at all times.
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