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Bent-Leg Body Twist
From: FM 7-22 October 2012
Purpose: This exercise strengthens trunk muscles and promotes control of trunk rotation (Figure 6-76).
Starting Position: Supine position with the hips and knees bent to 90 degrees, arms sideward, palms down with fingers spread. Knees and feet are together, and head is raised two or three inches off the ground with the chin slightly tucked.
Cadence: SLOW
  1. Rotate the legs to the left while keeping the upper back and arms in place.
  2. Return to the starting position.
  3. Repeat count 1 to the right.
  4. Return to the starting position.

Figure 6-76. Bent-leg body twist
Check Points:
  • Tighten the abdominal muscles in the starting position and maintain this contraction throughout the exercise.
  • The head should be off the ground with the chin slightly tucked.
  • Ensure that the hips and knees maintain 90-degree angles.
  • Keep the feet and knees together throughout the exercise.
  • Attempt to rotate the legs to about 8-10 inches off the ground. The opposite shoulder must remain in contact with the ground.
Precautions: This exercise is always performed at a slow cadence. Do not rotate the legs to a point beyond which the arms and shoulders can no longer maintain contact with the ground.

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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