Nope. Sitting down is a great way for you to rest and focus. The real problem is that when you regularly put your body into any specific position for a long ti

Nope. Sitting down is a great way for you to rest and focus. The real problem is that when you regularly put your body into any specific position for a long time, you really need to stretch the opposite position to make sure your muscles stay flexible instead of locking up. I spend a lot of time sitting at work and home. So I make sure I always inverse the stiffing muscles by stretching the inverse position. Just stretching 5 min a day (and going for a 30+ minute walk) fixed the problems I previously had.