Plank

Get into a push-up position on your forearms with elbows under your shoulders. Keep your body in a straight line from head to heels. Brace your core and hold the position for the prescribed time.

Pro Tips

• Squeeze your glutes and brace like someone is about to punch your stomach
• Don’t let your hips sag or pike up
• Breathe normally — don’t hold your breath

Muscles worked

Primary: Transverse abdominis (deep core stabiliser — the primary muscle generating intra-abdominal pressure) and rectus abdominis (resisting spinal flexion throughout the hold). The plank is an anti-extension exercise: the core resists the gravitational pull that would cause the lower back to sag toward the floor.

Supporting: Glutes (hip extension to maintain the straight line from head to heels), erector spinae (lumbar extension stability), shoulder stabilisers — serratus anterior, rotator cuff, lower trapezius — (maintaining the shoulder position above the elbows), hip flexors (minor, preventing hip drop).

Common mistakes

Hips sagging: The lower back collapsing toward the floor is the most common plank error and means the core is failing to resist extension. Either reduce the hold time or progress from a knee plank until strength improves.

Hips piking up: Raising the hips above a straight line (buttocks in the air) reduces the anti-extension demand dramatically and turns the plank into a modified pike hold. Keep the body horizontal from head to heels.

Head position: Looking forward or upward strains the cervical spine. The head should be in neutral alignment — looking at the floor slightly ahead of the hands.

Treating duration as the only progression: Adding more time to a plank plateau is less effective than adding load (weighted plank), difficulty (extending the arm or leg), or instability. Once a 60-second plank is comfortable with perfect form, the next step is progression beyond duration.

Programming notes

The plank is the standard beginner anti-extension core exercise and a common warm-up drill across all types of programmes. Its value is primarily in teaching proper bracing mechanics and developing baseline core endurance — both of which carry over to more demanding loaded exercises (squats, deadlifts, overhead pressing).

Typical programming: 2–3 sets of 20–60 seconds. For lifters with a developed core, the standard plank provides minimal training stimulus — progress to weighted plank, ab rollout, or Pallof press variations. The plank’s greatest value is as a teaching tool and activation drill rather than a primary core development exercise for trained lifters.

Frequently asked questions

How long should I hold a plank to build core strength?

For most lifters, 3 sets of 20–45 seconds with a genuine full-body brace is more valuable than grinding out a single two-minute hold. Research on isometric training suggests that accumulated time under tension matters more than any single set duration — once you can hold 60 seconds with perfect form and controlled breathing, adding more time gives diminishing returns. At that point, progress by adding load (a weight plate on the back) or moving to a more demanding variation like the ab rollout. Chase quality of contraction, not clock time.

Should I do planks every day?

Daily planks are fine for beginners building bracing awareness, but the plank is an accessory drill, not a primary strength stimulus. Your core gets significant isometric work in every compound lift you do — squats, deadlifts, and pressing all require it. Two to three plank sessions per week within a structured programme is enough for most lifters. If you find yourself plateaued and treating daily planks as core “training”, that’s a signal to add a harder variation rather than more frequency.

Why do my shoulders burn more than my core during planks?

Shoulder fatigue during planks usually points to one of two things: your elbows are placed too far forward from your shoulders, which shifts load onto the shoulder girdle instead of distributing it across the whole chain, or your serratus anterior — the muscle that protracts and stabilises the shoulder blade — is a weak link. Fix your elbow position first (directly under the shoulders) and actively push the floor away to engage the serratus. If the shoulder fatigue persists even with correct setup, targeted serratus work such as push-up plus variations will address the gap.