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Saw this in Gizmag:
http://www.gizmag.com/swedish-walking-bungypump/26293/
"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."
http://www.gizmag.com/swedish-walking-bungypump/26293/
"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."