A close grip shifts the load from lats to biceps, making your biceps bulge. Can do six reps? Add a weighted vest.
DO IT Hang from a bar, palms facing you, hands 15cm apart. Pull your chest to the bar, then lower. That’s 1 rep. Do 3 to 5 sets of 3 to 5 reps; rest 1 to 2 minutes between sets.