Hey Florian,
I think you did a good job but I think you could push a little bit more on capturing the movement feeling of the gesture, the way I see it seems like you outlined the body shape (which is completely normal when we begin to draw lines of action).
Try to have a nice flow and exaggerate the pose a lot because we usually tend to stiff the gesture when we draw.
Proko has a nice tutorial of how to draw gesture, maybe it will be worth to watch it:
Also, there's a few websites where you can can find a lot of poses and set the time to practice, I'll leave there here:
https://quickposes.com/en
https://line-of-action.com/
http://reference.sketchdaily.net/
That's the way to go, keep going!!! :))