I haven't been able to do anything outside since about the end of September. For the last three days it's been between -50F and -60F; I wouldn't go outside unless I had a death wish.
I purchased a treadmill in the early fall when I realized I wasn't getting outside again until April, and it is easily the greatest thing I've ever bought. I use it everyday, jogging for 30-35 minutes every second day and walking on it in between.



And I have the Total Body Trainer by Jake. I have the ball but I wasn't using it much so I deflated it. 