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A straight bar is like a barbell but shorter.

Starting position- hold the bar in front of you in the underhand position (palms facing away).
Movement- Curl the weight up to your chest without moving your elbows (keep them at your side). Then back down.

Note- Keep a slow controlled movement. Reverse curls are a great variation exercise. Do the same movement with an overhand grip instead.

Picture Source: Getting Stronger by Bill Pearl and Gary T. Moran, Ph.D.