Gizmag Review February 19th 2013
Poles used for wilderness trekking and Nordic walking are rigid in nature and provide static contact with the ground. Some poles use an anti-shock system that provides a little bit of spring action to limit the impact on the joints.
BungyPump poles, in contrast, use an internal suspension system to provide a much more drastic motion. The smaller mid-section retracts into the upper section every time they hit the ground, providing more movement of the arms. The poles have enough travel to allow for most of the mid-section to be engulfed by the upper shaft. The user can adjust the resistance of the suspension, changing how much weight he is pressing down for different levels of workout.
Click on the link to read the full review; http://www.gizmag.com/swedish-walking-bungypump/26293/