Curl-ups per unit of time how much the number of abdominal muscle endurance is good or bad sign of flexibility. Services muscular pain in your lower spine can be avoided to maintain good body posture. Approach is to sit, arms crossed hug his chest, legs and knees raised, heels and 30-40 cm away from the hip, toe hook along the bottom of furniture. Who sit on the lift, until close to the thigh, head as far as possible reach. Required in 1 minute repeated continuously try to do.