Usual reasons -work, study and family commitments. Just got a treadmill so even if I cant leave the house I can still run. I'm determined to make time for regular running, aiming for a running routine rather than building up distance.
As someone who is getting back into running this looks like a great challenge. For me the challenge would be ensure I kept up the mileage throughout the whole year at a steady rate rather than going crazy in the first couple of months then doing nothing.
Having tried a quick run on the 4000 it felt very sturdy and I liked its thick belt and easy to use control panel. I also tried a nordic track 18 but hated the way it paused between setting a speed and then it starting. Probably going to puchase the 4000 in the next couple of weeks so I can get it delivered over Christmas.