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Side Plank Hold

The side plank hold balances the body on one forearm and the edge of the feet, forcing the obliques and deep waist muscles on the lower side to resist gravity for time. It is the benchmark exercise for lateral core strength and a fixture in evidence-based trunk-training programs. Coached by Maddy (NASM-CPT) — these are the exact form cues he gives on every client's first week.

Muscles worked

Obliques Deep lower back · quadratus lumborum Outer glutes · gluteus medius Deep core · transverse abdominis

Sets & reps by goal

Goal	Sets × Reps	Rest
Strength	4 × 15–25 s hold per side	90 s–2 min
Muscle	3 × 30–45 s hold per side	60–90 s
Endurance	3 × 45–75 s hold per side	45–60 s

Level — Intermediate

Intermediate — the full-length lever asks a lot of the waist; the knee-down version is the honest on-ramp.

Proper form — 5 cues

Set the elbow directly under the shoulder, forearm flat
Stack the feet or stagger them heel-to-toe
Lift the hips until head, hips and heels form one straight line
Push the floor away through the forearm — no sinking into the shoulder
Fix your gaze straight ahead and hold the line without wavering

Breathing: Never hold your breath — keep slow, even breaths flowing for the whole hold.

The 3 mistakes Maddy corrects most

Hips drooping below the body line. The droop is the exact failure the exercise trains against — held in that position, the load moves into passive tissue at the waist and shoulder. Fix: End the set at the first sag; three shorter honest holds beat one long collapsed one.

Rolling the chest toward the floor. Forward rotation lets the front abs and the shoulder share work the obliques should own. Fix: Stack the top shoulder over the bottom one and imagine your back sliding along a wall behind you.

Elbow placed ahead of the shoulder. An offset elbow shears the shoulder joint and burns it out before the core is ever tested. Fix: Look down before lifting: the elbow should be hidden directly beneath the shoulder, not visible ahead of it.

Common questions

How long should I be able to hold a side plank?

A useful working target for healthy trainees is 30 to 45 seconds per side with a perfectly straight line, and roughly equal times left and right. A noticeable gap between sides is worth training away — give the weaker side an extra set rather than extending the stronger one.

Side plank vs regular plank — do I need both?

Yes, because they resist different forces. The front plank trains the body to resist sagging front-to-back; the side plank trains it to resist bending sideways, which the front version barely touches. A trunk program built around both covers the spine from more directions than either alone.

Why does my shoulder give out before my core in side planks?

Usually the supporting shoulder is collapsing instead of actively pushing. Drive the forearm into the floor so the shoulder blade hugs the ribcage, and check the elbow sits directly under the shoulder. If it still fatigues first, build capacity with the knee-supported version while the shoulder catches up.

Related exercises

Easier: Side Plank Hold (Modified) · Harder: High Side Plank Hold

Forearm Side Plank (Modified)Obliques · Deep lower back Side Body StretchLats · Obliques Spine Lateral FlexionLats · Obliques Standing Side ReachLats · Obliques Side Plank Reach ThroughObliques · Deep lower back

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