The figure 1 to 3 are the wrong stance, because the voltage to jump with the lumbar so it over 2 images will result in disease with lumbar area is tha lift was supposed to bend the knee and back straight.
Figure 1 and 3 are wrong, because the manner in which to act on it over the lumbar Figure 2, it will contribute to the pathogenesis of lumbar landing was supposed to lift the knees bent and back straight.
That figure 1 with 3 is wrong because the force acting to act with lumbar it more than the second picture will result with the lumbar cause disease. . tha lift that was supposed to bend the knees and back straight.