#1 Once you find a good enough edge, the stress is reduced, severely
#2 The sedentary issue is real, especially if daytrade, swing traders obviously not an issue
However, here's a real solution, a desk threadmill, simple walking speed, 1.5-2MPH will keep you away from the dreaded chair, which is a killer and very easy to type and control pointer at those speeds, as you get better, you will obviously gain more skills to walk faster as you work.
Not the main setup but for casual web browsing, ET bitching or casual chart studies works for me. Many times I watch sports or movies as well since I conveniently situated it in front of my TV.
Whatever gets you away from a chair or sofa, and the bed, that's for sleeping and shagging.