I don't use one ... I am fine with sitting as long as I workout regularly. That means I'm definitely doing squats or leg press as well as upper and lower back e

I don't use one ... I am fine with sitting as long as I workout regularly. That means I'm definitely doing squats or leg press as well as upper and lower back exercises. I need this not only to tire me out so I don't get restless sitting but also for posture and support. Eat little or no lunch -- light salad or soup or just yogurt and fruit -- to avoid fatigue and digestive troubles.