Start in the dead-hang pull-up position. Instead of pulling straight up, pull to your left side, touching the top of your left pectoral to the bar. Descend under control, then do the same thing to the right.
You can also go side-to-side for two reps before descending: pull to the left, hold at the top, transition to the right, then lower yourself. Start the next rep by pulling to your right.
"If you put a group of the most successful strength coaches in one room and their students in another, the students wouldn't agree on any training philosophy or principle, whereas the coaches would agree on almost everything."