Copenhagen Plank for Inner Thighs & Core: Complete Guide 2026

If you’re looking to strengthen your inner thighs and core without spending hours at the gym, the Copenhagen plank is one of the most efficient exercises out there. It’s simple to set up—you really just need a pillow or cushion—and you can do it at home in five minutes. The move targets muscles that most people neglect, which means you’ll probably notice real results pretty quickly if you stick with it.

n

The Copenhagen plank is the single most effective bodyweight exercise for targeting your inner thighs and obliques simultaneously — and most people have never tried it. If your inner thighs feel perpetually weak or your core collapses under load, this one move fixes both in under 10 minutes a day.

n

Last updated: June 2026

n

n

What Is the Copenhagen Plank?

n

Here’s how it works: you set up like a side plank, but instead of your feet stacked on the floor, your top leg rests on an elevated surface — a bench, couch arm, or box — while your bottom leg hangs free. That hanging leg is the secret. Your adductors fire hard to lift it toward your top leg, while your entire lateral core braces to keep your hips from sagging.

n

A 2019 study published in the British Journal of Sports Medicine found Copenhagen adductor exercises significantly reduced groin injury rates in soccer players — 41% reduction over a single season. But you don’t need to be an athlete to benefit. According to the American Council on Exercise, hip adductor weakness is one of the most overlooked contributors to knee tracking issues and lower back pain in everyday adults.

n

How to Do the Copenhagen Plank (Step-by-Step)

n

n
1. Set up your surface. Place your top ankle or knee on a bench 12–18 inches high. Your forearm goes directly below your top shoulder.

n

2. Lift your hips. Press into your forearm and top leg to raise your body into a straight line from head to heel.

n

3. Engage the bottom leg. Actively squeeze your bottom leg up toward your top leg — don’t just let it dangle. This is where your adductors work.

n

4. Hold the position. Keep your hips stacked, core tight, and glutes squeezed. No rotation, no sagging.

n

5. Breathe. Exhale steadily through the hold. Holding your breath spikes internal pressure and kills your stability.

n

n

Beginner modification: Rest your knee (not ankle) on the surface and keep the bottom foot on the floor for support. Work up to 3 × 10-second holds before attempting the full version.

n

When to see a doctor first: If you have a current groin strain, hip labral tear, or sharp hip pain during side-lying movements, consult your physician before adding this exercise. The Mayo Clinic recommends clearing any new exercise with your provider if you’ve had a lower-extremity injury in the past 6 months.

n

Best Gear for Copenhagen Planks at Home

n

n

n

n

n

n

n

n

n

n

n

n

n

n

n

n

n

n

n

n

n

n

#1. Thick Foam Exercise Mat (2-inch) — Best for Forearm Comfort

n

Your forearm takes the brunt of every Copenhagen plank rep, and a standard 6mm yoga mat simply isn’t enough. A 2-inch thick foam mat absorbs elbow pressure, prevents mat-burn on hard floors, and stays grippy even when you’re sweating. If you’re doing 3 sets back-to-back, comfort directly affects how long you can hold proper form — and most people add 8–12 seconds per set just by switching mats.

n

n
• ✅ 2-inch density eliminates forearm pain on tile or hardwood

n

• ✅ Non-slip bottom keeps the mat stationary during holds

n

• ✅ Large enough for full side-plank length without hanging off the edge

n

• ❌ Bulkier than a standard yoga mat — harder to store in small apartments

n

n

n

#2. Adjustable Plyometric Box — Best for Progressive Overload

n

The height of your elevated surface changes everything. A higher surface (18–24 inches) increases the lever arm and makes the plank dramatically harder; a lower surface (12 inches) is perfect for beginners. An adjustable plyo box lets you scale difficulty week by week — which is exactly how you add progressive overload to an isometric exercise without adding time. Most 3-in-1 boxes offer 16, 20, and 24-inch settings.

n

n
• ✅ Three height settings match beginner, intermediate, and advanced difficulty

n

• ✅ Sturdy enough to hold body-weight force without sliding

n

• ✅ Doubles as a step-up platform for full lower-body workouts

n

• ❌ Heavier boxes (40+ lbs) are not easy to move between rooms

n

n

n

n

Frequently Asked Questions

n

How long should I hold a Copenhagen plank?

n

Start with 3 sets of 15–20 second holds and rest 60 seconds between sets. Once you can hold 3 × 30 seconds with perfect form, increase surface height rather than adding more time.

n

Will the Copenhagen plank actually slim my inner thighs?

n

It won’t spot-reduce fat — no exercise does — but it will build and tone the adductor muscles, which visibly improves inner thigh shape within 6–8 weeks of consistent training. Pair it with a calorie-managed diet for visible fat loss results.

n

Is the Copenhagen plank safe for beginners?

n

Yes — with the knee-supported modification on a low surface (12 inches), it’s accessible to most healthy beginners. Avoid it entirely if you have an active groin strain or hip impingement, and consult your doctor if you experience sharp pain during any side-lying position.

n

Our Pick

n

A quality 2-inch foam exercise mat is the one piece of gear that makes every Copenhagen plank session more productive — it protects your forearm, keeps you stable, and removes the one discomfort that causes most people to quit the hold early. Grab one, prop your ankle on your couch arm, and start with 3 × 20 seconds tonight. Your inner thighs will feel it tomorrow.

n

n

n

n

n

You Might Also Like

5 Medicine Ball Core Mistakes Costing You Power in 2026Dragon Flag Exercise: Ultimate Guide to Advanced Core Strength100 Rep Ab Workout Under 10 Minutes: 30-Day Challenge (2026)