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Extend and Flex
From: FM 7-22 October 2012
Purpose: This exercise develops flexibility of the hip flexors, abdominals, hip (position 1–extend, Figure 8-14), and the low back, hamstrings, and calves (position 2–flex, Figure 8-14).
Starting Position: The front leaning rest position.
Position 1: On the command "Ready, STRETCH," lower the body, sagging in the middle, keeping the arms straight and look upward. Hold this position for 20-30 seconds.
Starting Position: On the command "Starting Position, MOVE," assume the starting position.
Position 2: On the command “Change Position, Ready, STRETCH,” slightly bend the knees and raise the hips upward. Straighten the legs and try to touch the ground with the heels. Move the head in line with the arms, forming an “A” with the body. Keep the feet together and hold this position for 20-30 seconds.
Starting Position: On the command "Starting Position, MOVE," return to the starting position.

Figure 8-14. Extend and flex
Check Points:
  • In position 1, the thighs and pelvis rest on the ground. Relax the back muscles while bearing the bodyweight through the straight arms. Toes point to the rear.
  • In position 2, the legs are straight and the arms are shoulder width apart, palms down on the ground. Relax the shoulders and push to the rear with the hands, forming an "A" with the body. Try not to round the shoulders.
  • Feet are together throughout the exercise.
Precaution: N/A
Variation: Soldiers, who are unable to extend the trunk in position 1 while keeping the arms straight and hips on the ground, may assume the modified position 1 shown above.

From: FM 7-22 October 2012 

  (Page last modified Feb 2, 2013) is dedicated to providing all the information you need to conduct the Army Physical Readiness Training as an individual or with a unit.  Everything you need from FM 7-22 is right here.
Chapter 1 Approach
Chapter 2 System
Chapter 3 Leadership
Chapter 4 Types of Programs
Chapter 5 Planning Considerations
Chapter 6 Special Conditioning Programs
Chapter 7 Execution of Training
Chapter 8 Preparation and Recovery
Chapter 9 Strength and Mobility Activities
Chapter 10 Endurance and Mobility Activities
Appendix A Army Physical Fitness Test
Appendix B Climbing Bars
Appendix C Posture and Body Mechanics
Appendix D Environmental Considerations
Appendix E Obstacle Negotiation
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