I bought a Steelcase Think about 3 years ago. It's been amazing up until recently, where I feel I am sitting too long in the day and I feel pressure behind my k

I bought a Steelcase Think about 3 years ago. It's been amazing up until recently, where I feel I am sitting too long in the day and I feel pressure behind my knees. When I move into a new place in the coming months, I'll be using a standing desk to work. What concerns me is when I am lounging around with my legs crossed or sitting indian-style, my legs go a little numb. I work out rigorously and play soccer often, so being healthy during long workdays isn't enough; I think standing will help with my legs and help maintain my good posture.