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Half Jack

A jumping jack with the arms raised only to shoulder height.

Conditioning Drill 2, exercise 3 of 5

Demonstration

Official photo sequences from the Army's drill manual, read left to right, top to bottom.

Half Jack: official ATP 7-22.02 photo sequence (figure 5-13, CD2.3 Half Jack) showing the positions of the exercise in order.
Figure 5-13. CD2.3 Half Jack · ATP 7-22.02, p. 5-11 (opens the official PDF)

Photos: U.S. Army Center for Initial Military Training, ATP 7-22.02. Approved for public release.

How to perform it

Conditioning Drill 2, exercise 3 of 5

Moderate cadence (80 counts per minute)Complete 5–10 repetitions.

Starting position

Position of Attention.

Counts

  1. 1Count 1. Jump and land with feet shoulder-width apart and pointed ahead, arms straight out to the sides at shoulder height, palms down, fingers and thumbs extended and joined.
  2. 2Count 2. Reverse the movement to the starting position.
  3. 3Count 3. Repeat count 1.
  4. 4Count 4. Return to the starting position.

ATP 7-22.02, para. 5-21, p. 5-11, Figure 5-13 (opens the official PDF)

What it develops

Trains jumping and landing with the legs apart and controlling the landing while moving the feet laterally.

Focus: Legs, Lateral movement, Landing control

Form

Drawn from the cited instructions.

Cues

  • Land with the feet shoulder-width apart and pointed ahead.
  • Raise the arms no higher than parallel to the ground.

Cautions

  • Do not raise the arms above parallel to the ground. The ATP says keeping them there avoids the shoulder impingement that repeated movement above shoulder height can cause.