Stop Doing Crunches and Try This Deep Core Move Instead
If your core still feels weak, doing more crunches and sit-ups may not be the answer. Those exercises mainly target the front ab muscles, but a strong core needs more than that. It needs deep stability from your ribs, armpits, hips, and spine working together.
Why Crunches and Sit-Ups May Not Be Enough
Crunches and sit-ups mostly work the rectus abdominis, the muscles people often think of as “six-pack abs.”
But your core is much bigger than that.
Your deep core muscles help stabilize your spine, support your lower back, and keep your body strong during everyday movement. If those muscles are not working well, your core can still feel weak even if you do a lot of ab exercises.
Repeatedly flexing and extending the spine through crunches and sit-ups may also place extra stress on the lower back for some people. That is why a safer and more effective option is to train your core to stabilize instead of constantly bending.
The Better Move: Active Chair Plank
This move looks like a plank, but the key difference is how you create tension. Instead of just holding yourself up, you actively pull against the chair or countertop to turn on the deep core muscles.
How to do it
Place your hands on a sturdy chair, countertop, or elevated surface.
Step your feet back into a plank position.
Squeeze your glutes.
Tuck your pelvis slightly.
Keep your shoulders away from your ears.
Imagine dragging your hands down and back toward your hips.
Hold that tension while keeping your body still.
What You Should Feel
When you do this correctly, you should feel muscles firing from:
Under your armpits
Through your rib cage
Across your deep core
Down toward your hips
The harder you pull your hands back, the more your core has to work.
How Long to Hold It
Start with:
10 to 30 seconds per hold
3 to 5 rounds
Rest between each round
Even if you are strong, this can feel challenging when you create real tension.
Key Form Cues
Squeeze your glutes
This helps keep your pelvis in a better position and protects your lower back.
Tuck your pelvis
Avoid letting your lower back arch. Think of gently pointing your tailbone toward the ground.
Pull, do not just hold
The most important part is dragging your hands down and back, like you are trying to pull the chair or countertop toward you.
Keep your body still
Do not let your hips sag, twist, or shift side to side.
Conclusion
If crunches and sit-ups are not helping your core feel stronger, it may be time to train your core differently. The active chair plank helps wake up the deep stabilizing muscles that support your spine, ribs, and hips. Practice it with control, create strong tension, and focus on quality over long hold times. This simple move can help your core feel stronger, safer, and more connected.