i figured out a long time ago that if i want to get anything done i have to be organized and stay on a (loose-schedule) i set timers...all the time. if i get on the computer i set the timer for 45 minutes...i figure 45 minutes is long enough to be sitting doing anything at one time...so when the timer goes off (mine beeps once with a 1 minute warning) i shut down and go do something else...i may come back a couple hours later for another 45 minutes. i also set the timer when i am sewing or quilting. when the timer goes off i get up and walk around, get a drink, maybe a snack, run any errands read the mail, make calls...at least 15 minutes before i go back to what i was doing. it has really been helpful for me to accomplish what i need to and i do not get so fatigued or stiff/sore.