Fixing the Car Seat Flaws for Better Posture
By Karen Roberts
Conversations with Karen
Hi everyone, and welcome back to Conversations with Karen.
Today we’re talking about something that really gets under my skin, and my bum: car seats. Yes, you heard me. Those seemingly innocent, modern-day thrones we sit in for hours while driving have become a bit of a bugbear for me—and here’s why.
The Modern Car Seat Problem: A Physio’s Perspective
I’ve been in physiotherapy for over 37 years, and I can say with full confidence that modern car seat design is not doing your posture any favors. In fact, there are two major design flaws that affect how your body sits and moves—even long after the drive is over. 
🚫 Flaw #1: The Forward-Tilted Headrest
Let’s start with that awkwardly angled headrest. I suspect someone somewhere decided that moving the headrest closer to the head would help prevent whiplash in rear-end collisions. In theory, that’s great. But in practice?
👉 It forces your head forward, pulling your neck and spine out of neutral alignment.
👉 This creates a “C-curve” shape in your spine—exactly what we want to avoid.
👉 A forward head position leads to tension, fatigue, and even injury risk during a crash.
🚫 Flaw #2: The Back-Tilted Seat Base
Now, take a look at the base of the seat. Notice how it tips downward toward the back?
👉 This creates a posterior pelvic tilt, pushing your pelvis under you.
👉 As your pelvis shifts, your head naturally tilts even further forward to balance your mass.
👉 The result? One big C-curve through your whole spine—and a recipe for discomfort and back strain and pain!
How to Fix Your Car Seat Posture: Karen’s K-Tips
Since car manufacturers don’t seem to be consulting physios (although they really should), here are some simple, affordable adjustments you can make today to support your posture and improve comfort while driving.
✅ Key #1: Adjust Your Hip and Knee Angles
Aim to sit with your hips and knees at 90 degrees. That’s your gold standard.
- Use a small folded towel, cushion, or wedge seat cusion to fill in the dip at the back of your seat—this helps flatten it out.
- If your knees are tilted upward, raise the seat base slightly.
- If your knees are pointed downward, lower the seat base until your hips and knees are level.
This little tweak creates better spinal alignment and reduces stress on your lower back.
✅ Key #2: Modify the Seat Back (Carefully)
Ideally, your seat back should be upright to support a neutral spine. But because of that headrest tilt, it’s a tricky balance.
- Adjust the backrest to as upright a position as possible—without your head being pushed forward.
- If needed, slightly recline the seat back until your head just grazes the headrest—not pressed into it.
You can also add a small lumbar roll or towel in the curve of your lower back-not your tailbone- to support a natural “S” curve.
Buying a New Car? Add This to Your Checklist
Posture matters—especially when you’re sitting for long stretches of time. So when you’re buying or leasing a new vehicle, check the seat angles and headrest position.
Ask yourself:
- Can I sit in neutral alignment without strain?
- Can I achieve a 90/90 hip-knee position?
- Does the seat allow for lumbar support?
Your spine will thank you.
Still Uncomfortable in the Car? It Might Be Your Body
If you’ve made all the seat adjustments and are still experiencing tension or discomfort, you may have some underlying inflexibility or mobility restrictions.
Don’t worry—you’re not alone. Many people lose natural movement over time without realizing it. But the good news? It’s fixable.
👉 Want to learn how to improve your flexibility and restore functional movement? Keep reading the articles here on our blog.
💡 Or join my class The Fix, where I’ll teach you how to support your posture and turn your body into its own exercise machine. Click here to learn more.
Final Thought: Your Posture Deserves a Pit Stop
Your car gets a tune-up—so why not your body?
Modern car seats may not have your spine in mind, but with just a few intentional changes, you can reclaim your comfort, support your posture, and make every journey a healthier one.
Thanks for listening.
Until next time,
Karen x
P.S. here are some resources you may find helpful:
