best arm workout

I recommend Sascha Huber. He has the most popular FitnessYoutube Channel in gernan speaking countries. For an arm workout you can zse thisone:

https://youtu.be/ZNQC_Dzr10U?si=q_-2ZYaytFduFgCE

The best is: you don't need any equipment! You work against your own resistance.

The best exercise in my opinion is shown in 3:30.

You train your bizeps on one arm and the trizeps on the other at the same time. Next exercise is to do it the other way round.