I mean - more of the actual use (non-chair-on-table) solutions?
I had a hernia two years ago, 31 year old developer.
I've seen some treadmill standing working hacks, I've tried the balance ball idea (I'm 1.92m - knees to high up for biggest balance ball).
I use Workrave consistently to lock me out of my PC out every 30 minutes, to force me to walk around and avoid pain medication.
Recommendations, tips, tricks, and and easy to build schematic appreciated.