How to prevent your legs from falling off whilst sober at a party?

I fail to handle a festival like a marathon. Usually it's klaplongen and moving around until the end. Keeping up this behavior while sober, it's until the clock hits 21:00-22:00 and then my legs are done.

During the upcoming Origins event, unresolved and Gearbox classics will be the final acts. Ill definitely regret it if I'm forced to sit down.

Any tips for "leg muscle management"? Do ya'll sit down preventively? Is not klaplongen early on even an option??

EDIT: Thanks for all the feedback within such a short period. I think the biggest contributor is just not taking breaks until it's too late.