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Handler
Exercise database

Plank Jack

Plank Jack is an advanced core exercise that primarily trains the core, with the shoulders, hip abductors and calves assisting. Equipment: bodyweight.

Library data updated AdvancedBodyweight

What this page is: structured data from Handler's own exercise library — the same cues, mistakes, ranges, and modifications the coach uses in the app. It is general exercise information, not an individual technique assessment or medical advice. Stop any movement that causes pain and seek qualified coaching or clinical care for injuries.

Demonstration loop from Handler's exercise library. Only the still frame loads until you press play.

Technique

Form cues for the plank jack

  1. 01

    Squeeze glutes and pull elbows toward toes without moving them.

  2. 02

    Exhale gently to set your ribs down before each rep or hold.

  3. 03

    Brace like you are about to be bumped from the side.

  4. 04

    Move slowly enough that your low back position does not change.

  5. 05

    Hop feet in and out while the upper body stays still.

Troubleshooting

Common mistakes

  • Holding your breath the entire time.

  • Letting the low back arch.

  • Moving faster than you can brace.

Programming defaults

Sets, reps, and rest by goal

These are the starting ranges Handler's library assigns to the plank jack for each training goal. They are defaults the coach adjusts from your logged sets, not a prescription for any individual.

GoalSets × repsRest between sets
Strength3 × 8–12 reps1 min 15 s
Hypertrophy3 × 10–15 reps1 min
Fat loss3 × 15–25 reps30 s
General fitness3 × 10–15 reps45 s

Between sets

  • Quality bracing beats longer sloppy holds.
  • Stand up or breathe tall between sets.

Working around discomfort

Modifications by body area

How Handler adjusts the plank jack when a lifter reports a sensitive area. These are training modifications, not treatment. Pain that persists or worsens needs clinical assessment.

Wrist
Use a neutral wrist position or reduce loading until the wrist stays quiet.
Shoulder
Use a pain-free range and keep the upper arm path controlled.
Lower back
Reduce load, brace before each rep, and stop if you cannot keep a neutral spine.

Progression chain

Easier and harder variations

Progress to

This is the most demanding step in its chain.

Questions about this exercise

What muscles does the plank jack work?
The plank jack primarily works the core. The shoulders, hip abductors and calves work as secondary or stabilising muscles. In Handler's library it is classified as a core movement.
What equipment do you need for the plank jack?
None. The plank jack is a bodyweight exercise, which is why it appears in Handler's anywhere setups.
How many sets and reps of the plank jack should I do?
Handler's default for a strength focus is 3 × 8–12 reps with about 1 min 15 s rest, and for a muscle-building focus 3 × 10–15 reps with about 1 min rest. These are the library's starting ranges, not an individual prescription; the coach adjusts them from what you log.
Is the plank jack suitable for beginners?
It is tagged advanced. A simpler starting point in the same progression chain is the cross-body mountain climber.

More core exercises

Invited TestFlight beta · iPhone-first

Let the coach program the plank jack for you.

Handler is our product. In the invited iPhone beta, the coach places exercises like this one into your plan, sets the starting ranges shown above, and adjusts them from the sets you log. Test build, not a public download.

Request beta access