Core
Windshield wipers are among the most demanding oblique exercises in calisthenics. Hanging from the bar with legs raised to 90° (L-hang), you rotate the legs side to side like a wiper, resisting with the obliques and lateral core.
Holding legs at 90° in a hang already requires considerable ab strength. Adding lateral rotation with that lever creates enormous demand on the internal and external obliques. An elite core drill.
Hang from the bar with a firm grip. Raise the legs to 90° (L-hang). Rotate the legs to one side as low as possible. Return to center. Rotate to the other side. One full cycle is one rep.
Bent-knee windshield wipers → fully extended legs.
3 × 8-10 full reps with straight legs.