Hear me out. One of the better things I did for myself. Electric standing desk (IKEA idasen, it's cheap and good), samsung ultrawide oled 49, and a small walking pad. Walking pad is like a treadmill, but small so I can easily put it aside and I can switch between sitting and standing and walking and I do all three during the day. It doesn't need much space even. I also have two chairs, one regular (also ikea, marcus - not great, not terrible) and a kneeling one for posture so I switch between when sitting. Really not much of an investment but overall great QOL improvement.