Do you know what the wiper abs are? These movements are very effective in working the obliques.
They are a rare type of abdominal but highly effective when working the obliques because their execution allows you to exercise that area completely.
To carry them out it is necessary to “hang” on the grips where you perform the pull-ups.
Your body will be in the air. At this point, bring your legs together and raise them so that the upper and lower trains form a “V”.
Right here, move your legs from side to side (similar to the movement of some windshield wipers) trying to keep your torso fixed.
Avoid flexing your legs, since the effectiveness of this exercise lies in fully stretching them and moving them to one side and the other as many times as possible.