This is achieved by designing cars in such a way that the pedestrian is pushed up onto the car in case of a collision, thereby reducing chances of injury. (rediff.com)
It also ramps up fatigue at an accelerated pace increasing chances of injury that will take you out of exercising and end up slowing losses. (renaissanceperiodization.com)
If lower back issues are present, modifications should be made to decrease chance of injury and increase probability of strength improvements. (j2fit.com)