Relaxed body posture - Tips

Hi there! Beginner/Intermediate boarder here seeking for advice how to get a better relaxed body position while boarding.

I know these pro kids were born in the mountains, but I was just wondering if any experience boarder can give some tips in how to practice to achieve a more relaxed and smother ride.

For instance, I recently came across Dusty Henricksen on Burton Open 2020 and this kid has soooo much style IMO.
Check it out his instagram on: @DustyHenricksen

For me it looks like he is so relaxed with a quite straight legs which contradicts to what I have been instructed to do. But definitely his body position is really smooth and he is in total control.

Anyway, check it out and let me know if you can share any tips.