Fysiqal
Balance
Balance

Side Plank

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core-stabilityanti-lateral-flexionside-plankisometricobliquesqlneuromotor

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Exercise demo
In one line

Hold the body in a straight line on one forearm and the side of the feet, resisting the hips dropping — the key anti-lateral-flexion core-stability hold and a strong lateral-hip/oblique drill.

Detail

Lie on one side, forearm on the floor with the elbow under the shoulder, legs stacked. Lift the hips so the body forms a straight line from head to feet, weight on the bottom forearm and the side of the bottom foot. Brace the core and hold without letting the hips sag toward the floor. The top arm can rest on the side or reach to the ceiling.

The side plank trains anti-lateral-flexion stability (see Anti-Movement Core Training (Anti-Extension, Anti-Rotation, Anti-Lateral-Flexion)): gravity pulls the hips down toward side-bending, and the lateral trunk muscles — the obliques (External Oblique, Internal Oblique) and quadratus lumborum — plus the lateral hip (Gluteus Medius) must resist to keep the spine neutral (see Spine Positioning — "S" Shape, Never "C"). It is one of McGill's "big three" core exercises.

Coaching:

  • Keep the supporting shoulder stable (down and back, not shrugged) and stacked over the elbow.
  • The main fault is the hips sagging; stop the set when the line breaks.
  • Train both sides equally; note asymmetries.

Progressions (see Balance Training Progression): increase hold time → top-leg or top-arm raise → add hip dips → feet/elbow on an unstable surface → from a straight-arm (hand) position. Regression: bend the knees so weight is on the bottom knee and forearm (short-lever side plank), or perform against a bench.

Key facts

  • Side-lying forearm/feet hold; straight head-to-feet line; hips up.
  • Trains anti-lateral-flexion stability (obliques, QL) + lateral hip (gluteus medius).
  • One of McGill's "big three" core exercises.
  • Fault: hips sagging; keep the supporting shoulder stable; train both sides.
  • Progress: longer holds → limb raises/hip dips → instability; regress to bent-knee (short lever).

Connections

See also: Side Plank — in the calisthenics plank progression is the same exercise placed in the front-plank/plank-progression track rather than the core-stability-training track covered here.

Sources

Cited in text — not yet linked
Verified/updated 2026-09-05: McGill SM, Karpowicz A. "Exercises for spine stabilization: motion/motor patterns, stability progressions, and clinical technique." Arch Phys Med Rehabil 2009;90(1):118-126 (the "Big 3" primary paper naming the side-bridge/side plank as one of the three) — see Anti-Movement Core Training (Anti-Extension, Anti-Rotation, Anti-Lateral-Flexion) for the full citation set.

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Atlas Connections

External Oblique
The largest, most superficial flat abdominal; flexes the trunk and rotates it toward the opposite side.
Gluteus Medius
A fan-shaped hip abductor under the gluteus maximus, important for balance in walking.
Internal Oblique
A flat abdominal sandwiched between the external obliques and transversus; its fibers run at right angles to the external oblique and it twists the trunk to the same side.
Anti-Movement Core Training (Anti-Extension, Anti-Rotation, Anti-Lateral-Flexion)Closely related
Train the core by resisting motion the limbs or a load try to impose — anti-extension, anti-rotation, and anti-lateral-flexion — rather than by repeatedly flexing the spine.
Balance Training Progression
Make balance harder by shrinking or destabilizing the base of support and removing sensory inputs — a staircase from two-feet stable to single-leg, eyes-closed, unstable-surface, and perturbation work.
Core Stability vs Core StrengthClosely related
Core strength is how much force the trunk muscles can produce; core stability is the trunk's ability to resist unwanted motion and keep the spine controlled — and for back health and force transfer, stability usually matters more.
Front PlankClosely related
Hold a straight-body position on forearms and toes, bracing so the spine does not sag — the archetypal isometric anti-extension core-stability hold.
Spine Positioning — "S" Shape, Never "C"
Stabilize the spine by holding it in a semi-isometric contraction so it keeps its natural "S" shape — never allow a "C"-shaped spine during exercise. This is a coaching cue for loaded lifting, not a literal, universal rule — see "Current nuance" below.