Quote Originally Posted by CA Jack View Post
Aside from a more natural, full run being achieved on the jenny, the fact is (running a mill) a dog is "moving a belt" ... but on the ground a dog (running a jenny) is propelling himself forward ... which is a major difference.

Anyone who's ever run a treadmill in a gym "moving a belt" will tell you it's a joke compared to actually running cross-country outside ...

Jack
compleatly tue!!. altho we have never been able touse a jenny we do stay away from these soupt up hypt up 7/8/9/10 time free spinning mills. they give you a AIROBIC workout only. insted of endurance..