Bodyweight Core Exercise

Plank

Exercise demonstration

The plank is the foundation of core stability training, building anti-extension strength that protects your spine during all movements. It's an isometric hold that teaches total-body tension and proper neutral spine positioning essential for all compound lifts.

Muscles Worked

Primary Muscles

  • Rectus Abdominis
  • Transverse Abdominis
  • Erector Spinae (Spinal Stabilizers)

Secondary Muscles

  • Anterior Deltoids
  • Serratus Anterior
  • Quadriceps and Glutes

How to Perform

  1. 1

    Setup: Begin on all fours with your forearms on the ground, elbows directly under your shoulders. Your forearms should be parallel to each other, hands flat or in fists. Position your feet hip-width apart with toes tucked under.

  2. 2

    Engage: Before lifting into the plank, take a deep breath and brace your core as if about to be punched. Squeeze your glutes hard and contract your quads. Create tension throughout your entire body—this isn't a relaxed position.

  3. 3

    Align: Extend your body into a straight line from head to heels. Your head should be in neutral position looking at the floor, not up. Maintain a posterior pelvic tilt by tucking your tailbone slightly under to prevent lower back arching.

  4. 4

    Breathe: Maintain steady breathing throughout the hold—don't hold your breath. Take controlled breaths while keeping your core braced and body rigid. Think "breathing behind the brace" to maintain tension while getting oxygen.

  5. 5

    Hold: Maintain perfect position for the prescribed time. If form breaks—hips sagging or rising—end the set immediately. Quality over duration always. Start with 20-30 second holds and progress gradually rather than sacrificing form for time.

Common Mistakes

  • Sagging Hips

    Letting your hips drop creates lumbar extension and defeats the anti-extension purpose of the plank. This loads your lower back instead of training your core to resist extension forces.

  • Hips Too High

    Piking your hips up turns it into a shoulder exercise and removes core engagement. Your body should form a straight line, not an inverted V. This is often an attempt to make the exercise easier.

  • Head Position Errors

    Looking up or letting your head hang down misaligns your spine. Keep your neck neutral by looking at the floor about a foot in front of your hands, maintaining a straight line from head to heels.

  • Holding Your Breath

    Breathing irregularly or holding your breath reduces time under tension and can spike blood pressure. Learn to breathe steadily while maintaining core tension—this translates to better bracing during heavy lifts.

Pro Tips

  • Create Full-Body Tension

    Squeeze everything—glutes, quads, abs, and even make fists. This irradiation effect makes the plank significantly harder and more effective. The plank should feel like a full-body exercise, not just abs.

  • Progress with RKC Plank

    Once standard planks become easy, use the RKC (Russian Kettlebell Challenge) variation: elbows further forward, pull elbows toward toes, and push forearms into the ground. This creates incredible tension in shorter holds.

  • Use the Posterior Pelvic Tilt

    Actively tuck your tailbone under and imagine pulling your ribcage toward your pelvis. This posterior tilt maximizes ab engagement and protects your lower back, teaching the same bracing pattern used in squats and deadlifts.

  • Multiple Short Sets Beat Long Holds

    Rather than one 60-second plank with degrading form, do 3 sets of 20 seconds with perfect tension. Quality reps build better core stability and transfer more effectively to your big lifts.

Variations

Side Plank

Target obliques and anti-lateral flexion with this side-lying variation.

RKC Plank

Advanced variation with elbows forward, creating maximum tension in shorter holds.

Plank with Leg Lift

Single-leg variation that challenges balance and anti-rotation stability.

Plank to Down Dog

Dynamic variation alternating between plank and pike position for active core work.

Alternatives

Dead Bug

Supine anti-extension exercise perfect for beginners or those with wrist issues.

Ab Wheel Rollout

Advanced anti-extension movement with dynamic lengthening under load.

Pallof Press

Standing anti-rotation exercise using cable or band resistance.

Hollow Body Hold

Gymnastics-based position emphasizing posterior pelvic tilt and total body tension.

Related Core Exercises

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