📖 Static demo — read-only snapshot

You’re browsing a static build of the Body IQ knowledge graph, so everything loads with no backend. A few things that need the live server are turned off here:

  • Global search (sidebar) is disabled — it queries the API.
  • The JSON API and the API “Try it” playgroundaren’t included.
  • The data is a snapshot — it refreshes only when the demo is rebuilt, not live from the database.

Everything else — the body map, progression ladders, coverage heatmap, exercise finder, and all anatomy/exercise/source pages — works fully. The full app (live search + API + database) runs from the source on GitHub.

Jumping Jack

Draftaerobic50%beginner⬤ expert-opinion evidence
View FHIR resourceFHIR R4 ActivityDefinition — the interoperable form of this exercise

Positions & Range of Motion

Start
standing tall with feet together and arms at the sides
End
feet jumped out wider than hip-width with straight arms swung out and overhead (hands near touching), landing softly on the balls of the feet
Range of Motion
rhythmic shoulder abduction ~0–180° with hip abduction/adduction; feet cycle from together to wider than hip-width and back

How to Perform

Stand tall with feet together and arms at your sides. Jump both feet out wider than hip-width while swinging straight arms out and overhead, then immediately jump back to the start position with arms returning to your sides. Repeat rhythmically, landing softly on the balls of the feet each cycle.

Watch on YouTube↗

Opens a YouTube search for “Jumping Jack”

Starting position: standing

Coaching Cues

  1. 1

    Land softly on the balls of your feet, letting the knees and ankles give a little on each landing.

    (external)
  2. 2

    Swing the arms through a full arc — hands touch (or nearly touch) overhead, then return to your sides.

    (external)
  3. 3

    Keep your ribs stacked over your pelvis — don't arch the low back as the arms go overhead.

    (internal)
  4. 4

    Find a steady, springy rhythm; jump only as high as needed to spread and close the feet.

    (external)

Evidence-Based Dosing & EMG Data

EMG Activation Data

Published EMG data specific to jumping jacks are sparse; activation is inferred from the component motions. The out-phase demands rapid concentric hip abduction (gluteus medius/minimus, TFL) with the adductor group decelerating eccentrically, and the pattern reverses on the return, making it a light reciprocal frontal-plane conditioning drill for the hip. The calf complex (gastrocnemius/soleus) cycles between concentric propulsion and eccentric landing absorption at low amplitude, similar to submaximal hopping. The overhead arm swing recruits the deltoid with the scapular upward-rotation force couple (trapezius and serratus anterior) at moderate, rhythmic intensities. Trunk musculature works isometrically to maintain upright posture against the fast bilateral limb movement. Overall intensity per muscle is low to moderate — the exercise functions primarily as aerobic conditioning, warm-up, and low-level plyometric coordination rather than a strengthening stimulus.

Muscles Involved (21)

Primary Movers

Gastrocnemius— Concentric plantarflexion powers each takeoff; works eccentrically to absorb landing.
Soleus— Shares plantarflexion propulsion and cushions repeated low-amplitude landings.
Middle Deltoid— Main mover for the arm swing into abduction toward overhead.
Gluteus Medius— Drives the hip abduction phase as the legs jump apart and controls frontal-plane pelvis position on landing.

Secondary Movers

Adductor Group (Longus/Brevis/Magnus)— Pulls the legs back to midline on the return jump (a lower-demand, partly momentum-assisted phase) and works eccentrically to decelerate the out-phase abduction.
Gluteus Minimus— Assists hip abduction and pelvic stability.
Tensor Fasciae Latae— Assists hip abduction during the out-jump.
Anterior Deltoid— Assists as the arms travel through the higher arc toward overhead.
Latissimus Dorsi— Powers the arm return into adduction/extension on the down-swing.
Quadriceps Femoris— Small knee extension for takeoff and shock absorption on each landing.
Supraspinatus— Initiates and assists glenohumeral abduction each rep.

Stabilizers

Transversus Abdominis— Deep trunk stiffness for repeated impact cycles.
Tibialis Anterior— Controls the foot/ankle in flight and at landing and helps reposition the foot each cycle.
Peroneus Longus (Fibularis Longus)— Lateral ankle stability during widened-stance landings.
Rectus Abdominis— Keeps the trunk upright and resists rib flare as the arms go overhead.
External Oblique— Anterolateral trunk control during rapid limb movement.
Erector Spinae Group— Maintains upright spinal posture against the overhead arm swing.

Lengthened / Stretched

Pectoralis Major— Sternal fibers are lengthened as the antagonist at the top of the overhead arm position.

Synergists & Assistors

Lower TrapeziusSynergist— Force couple with upper trapezius and serratus anterior for scapular upward rotation.
Upper TrapeziusSynergist— Contributes to scapular upward rotation as the arms elevate overhead.
Serratus AnteriorSynergist— Upwardly rotates the scapula so the arms can reach overhead.

Easier Variations ↓

1

Step Jack (Low-Impact Jack)

Alternate stepping one foot out to the side while performing the same overhead arm swing, eliminating the jump and impact. Useful for deconditioned patients, joint pain, or early return to activity.

2

Arms-Only Jack

Stand (or sit) with feet still and perform only the rhythmic arm abduction-adduction swing. Trains the shoulder pattern and raises heart rate without lower-extremity impact.

Harder Variations ↑

1

Power Jack (Squat Jack)

Jump the feet out into a quarter-squat landing and explode back to standing, increasing lower-extremity loading and plyometric demand.

2

Weighted or Extended-Duration Jacks

Add light dumbbells or a resistance band at the arms, or extend continuous work intervals (e.g., 45-60 seconds at pace) to increase strength-endurance and cardiovascular demand.

Target Movements (9)

Shoulder AbductionGlenohumeral Joint
Shoulder AdductionGlenohumeral Joint
Hip AbductionHip Joint (Coxofemoral)
Hip AdductionHip Joint (Coxofemoral)
Ankle PlantarflexionTalocrural Joint
Ankle DorsiflexionTalocrural Joint
Scapular Upward RotationScapulothoracic Articulation
Knee FlexionTibiofemoral Joint
Knee ExtensionTibiofemoral Joint

Why This Exercise Matters

Everyday activities this exercise helps you do — essential means it directly trains the capacity the task needs:

Jumping & LandingessentialRunning and Jogging

Research Notes

claude-researched 2026-07; muscle/movement links validated against the roster. Adversarial clinical verification pending — do not promote past needs_review without human review.