Position - Holding the same position as the preceding exercise (situps). Without bending the knees and insteps extended, slowly raise the legs far enough to have them form a right angle with the trunk at the hip as in figure 2. Lower slowly. Repeat 4 more times. Basically, they are leg lifts.
(Note - the chair is just to show a right angle. It is not involved in the exercise)
Breathing - Exhale when legs go up. Inhale deeply when you lower them. Do not try to make respiration follow the movements; make the movements follow the rhythm of normal breathing.