Interesting. I am suffering from such an issue today as a matter of fact. couple of days ago, I sat awkwardly, with my dog on my lap...and injured my knee.
My suggestion....play the Big Blind standing up.
If you stand up, once per orbit, your posture gets a chance to reset.
Outside of this, most experts will agree that a regime of daily exercise is beneficial to both your health and your mental game. In the end, success is determined by habit. Once a positive behaviour becomes habitual, you are set to be impacted by it. So make sure your habits are positive.
Cheers,
ObbleeXY