So, this is some very strange guy on Sandra's E640 spring (I guess it was made for heavy people fwith a weight about 100-120Kg)
My weight is about 75Kg, but hard springt are better for jogging, she's able to push the spring hard enough to jump up to a 1.50 meter height, ethough we have about the same weight, well, she's doing the powerstilting since 2 years, she's much more trained and experienced than I am ^^

Photo (C) Syah