Sit-ups to train in the first line, not the back, but the straight abdominal muscles – however, this represents an important counter-weight to the back muscles. Therefore, it should not be neglected in the case of back problems, there is also the abdominal muscle training.
You lay with your back on the floor and place the feet. You fold your arms behind your head and lift head and upper body slightly. The view remains on the ceiling. Repeat the Exercise ten times. After a short Pause, two more series.