I'm doing well on the walking machine (treadmill) and I'm up to 30 min a day ( not all at once - just in 10 min burstsThe beauty of it is that I can watch tv while I'm walking so I hardly notice the minutes slip by. I'm already noticing a slight improvement in the tightness in my legs and the night pain from my knees has certainly lessened. It's also been good at the moment because we have had torrential rain for days - and I can walk inside away from the weather!