The windshield wiper is a pull-up bar exercise that works your obliques and core mobility. At the same time, you also strengthen the straight abdominal muscles and improve the tension in the entire upper body.
A contribution by Christoph Völker from target10a.com
The Windshield wiper on the pull-up bar is an efficient exercise to build your core muscles to train and the trunk mobility to improve
Windscreen wipers: This is how the exercise works
You hang on the bar with stretched arms in an overhand or underhand grip. The legs point straight up, the upper body is horizontal. Now fold your legs alternately to the left and right at hip height. It all happens without stopping.

execution and effect
Try to do 3 sets of 6 to 12 repetitions each. Break about 2 minutes. The cleanest possible execution is important. That means the back is straight and horizontal, the legs are stretched. You should also achieve as much range of motion as possible. In other words, lower your legs to hip level (but not lower!).
The exercise primarily strengthens the lateral abdominal muscles and improves trunk mobility. In addition, the straight abdominal muscles and the tension in the entire upper body are trained.

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Credits: Cover picture Christoph Völker/target10a.com