• sit-up = a supine posture, bend your knees, head and shoulders above the •. That is the exercise the abdominal muscles (rectus abdominis muscles) is very famous .
• Sit-up = tha is lie their knee lift head and shoulders above ground • This port is the port of abdominal muscles (rectus abdominis muscles), the most famous .
• sit-up lie = Tha out Bend the knee lift the head and shoulders up and over the ground • Tha this is a management position abdominal muscles (rectus abdominis muscles), the most famous