STANDARD
The Trunk Flexion is the tenth exercise in the strength training machine drill.
This exercise develops strength in the abdominal muscles.
Figure 15-18 shows the exercise as a Soldier conducts it:
Starting Position
The starting position for the Trunk Flexion is the Sitting position with the knees bent at 90 degrees and feet flat on the floor.
From the starting position, stay seated with the feet firmly on the ground.
Select the appropriate weight and ensure the pin is secure in the weight stack.
Keep the elbows shoulder-width apart and bent at 90 degrees, with hands in a closed grip.
Place the hips and low back firmly against the seat back with the eyes looking straight ahead.
Count
● On count 1, bend forward, flexing the trunk and bringing the chest to the thighs.
● On count 2, return to the starting position.
MODIFIED TRUNK FLEXION
The modified Trunk Flexion should be used when a DA Form 3349 may limit the range of motion at which a Soldier can safely perform Trunk Flexion exercises.
The weight load should be low and the range of motion of the movements should be within the comfort zone of the Soldier.
Gradually increase the weight load and range of motion as tolerated until the exercise can be performed to standard.