Useful Links

Bowflex Treadclimber TC5000 On Wikipedia
In 2003 Bowflex released the TreadClimber, a cardio machine similar to a treadmill but with two independent walking surfaces, called "treadles". Bowflex claims the unique design of the TreadClimber allows for twice the calories burned compared to a flat treadmill used at the same speed.
http://en.wikipedia.org/wiki/Bowflex

Bowflex Treadclimber TC5000 On Youtube
Bowflex Treadclimber TC5000 Review
http://www.youtube.com/watch?v=slSnNg1wVKQ&feature=player_embedded