Instructions:

1. Sit on a bench with your feet flat on the ground and hold a barbell with an underhand grip, palms facing up.
2. Rest your forearms on your thighs, allowing your wrists to hang off the edge.
3. Slowly curl your fingers towards your palms, squeezing the barbell tightly.
4. Hold the contraction for a moment, then slowly release your fingers back to the starting position.
5. Repeat for the desired number of repetitions.