Performing the: A Step-by-Step Tutorial Assisted Close-grip Underhand Chin-up
If you're using an assist machine, place your knees on the pad or feet in the foot straps, adjust the weight as needed to provide the appropriate amount of assistance.
Pull your body up towards the bar, keeping your elbows close to your body and your back straight, until your chin is level with or above the bar.
Hold this position for a moment, focusing on the contraction in your biceps and back muscles.
Slowly lower your body back to the starting position, ensuring to fully extend your arms, and repeat the exercise for the desired number of reps.