As a chiropractor at Price Health, I’ve helped lots of people improve their core strength while protecting their spine.
After over 20 years serving the Waterloo region, I’ve learned that proper technique makes all the difference between building strength and causing injury.
Crunches, when done correctly, can strengthen your abs safely. But first, let’s talk about why we recommend crunches over the popular sit-up exercise.
Why sit-ups are the worst exercise for your back
Sit-ups are still very common in gyms today. But this exercise creates more problems than it solves.
World famous spine biomechanist Dr. Stuart McGill of University of Waterloo points out that our spine is at its weakest when it’s bent and twisting.
When you do a sit-up, it creates a large compressive force on the spine through muscle activation. Then you bend the spine under compression. This is not good.
As soon as the spine is really curved, you’re compressing it with muscle activation – really, really bad.
Here’s what happens:
- Your curved spine gets pushed against the floor
- Hip flexors become overworked and pull on your lower spine
- Repeated spinal flexion accelerates disc wear and tear
- You’re training a movement you only do once per day (sitting up in bed)
All the best abdominal and core strengthening exercises are done with a perfectly straight spine nowadays.
How are ab crunches different?
Crunches target your rectus abdominis (the “six-pack” muscle) while keeping your lower back safe.
Crunches, when performed correctly, address many of these issues by:
- Keeping your lower back pressed to the floor
- Limiting the range of motion to reduce spinal stress
- Focusing on abdominal muscle activation rather than hip flexor dominance
- Maintaining better spinal alignment throughout the movement
This makes crunches much safer for your spine while still building strong abs.
Beginner crunch technique: The curl-up method
If you’re new to crunches or returning to exercise after an injury, start with this spine-safe beginner technique I teach that emphasizes proper form.
Starting position:
- Lie on your back with one knee flexed and one leg straight
- Place both hands flat on the small of your back with your elbows resting on the ground
- Create an abdominal brace by gently drawing your navel toward your spine. This activates your deep core muscles and protects your lower back.
The movement:
Flex from the upper spine only – not the lower lumbar spine. The rotation should occur at the level of your sternum (breastbone). Lift only your head, shoulders, and upper back while keeping your lower back in contact with your hands.
If you feel any neck strain or pain, stop and push your tongue forcefully into the roof of your mouth. This inhibits neck muscles and relieves strain.
Start with 5-8 perfect repetitions, focusing on form.
Intermediate technique: Lift those elbows
Once you master the beginner version, here’s how you can make it more challenging.
The change: Lift your elbows only slightly off the ground – about one inch. This prevents you from pushing off with your elbows and increases the challenge to your abs.
Everything else stays the same:
- Same body position
- Same upper spine flexion movement
- Same abdominal bracing
- Same controlled movement
Key focus points:
- The movement should still originate from your upper spine, not your lower back
- Your hands should barely touch your lower back – they’re there for awareness, not support
- Maintain steady breathing throughout the movement
- Control both the lifting and lowering phases of the exercise
Work up toward 10-12 repetitions per set, performing 2-3 sets.
Advanced technique: Force and breathing
The advanced version looks similar but adds two key challenges.
Advanced modifications:
- Enhanced bracing: Maintain your abdominal brace with much more force than in previous versions. This increased tension will activate your obliques and provide internal resistance against your abdominal muscles.
- Breathing challenge: At the top of your curl-up, breathe forcefully as if you’re out of breath. This dual-task challenge requires your abdominals to perform two functions simultaneously – maintaining stability while managing respiratory demands.
- Functional integration: This breathing pattern helps train your core muscles to stabilize your spine while under the demands of challenging breathing, which mimics real-life scenarios when you might be fatigued or under stress.
Why this works: This advanced technique helps reduce your risk of injury when fatigued by training your core to maintain stability even when other demands are placed on these muscles.
Advanced protocol: Perform 12-15 repetitions for 2-3 sets, focusing on maintaining both the enhanced brace and the breathing challenge throughout each set.
When to avoid crunches
Skip crunches if you have:
- Current back pain or injury
- Neck problems
- Recent abdominal surgery
- Herniated discs or other spinal conditions
Our physiotherapy team can help assess if crunches are right for you.
Popular Alternatives to Crunches
If crunches aren’t appropriate for you, or if you want to diversify your core training, consider these spine-friendly alternatives:
Planks
The gold standard for core training, planks work multiple muscle groups while maintaining a neutral spine position. Target your obliques and lateral core muscles while supporting spinal health.
Dead bugs
An excellent exercise for core stability that trains your abdominals while keeping your back in a safe position.
Bird dogs
As detailed in our comprehensive bird dog guide, this exercise challenges core stability while strengthening the posterior chain.
Core strengthening at Price Health in Waterloo
Since 2003, I’ve been part of a team that has helped Waterloo region residents build stronger cores safely. We offer an integrated approach including:
- Chiropractic care using techniques like Active Release Therapy
- Physiotherapy with movement assessments and exercise prescription
- Massage therapy to address muscle tension and imbalances
- Fitness coaching through The Fit Club
My colleagues who specialize in lower back pain treatment and I work together to ensure you’re building strength without creating problems.
Strong core muscles give your spine the extra support it needs for proper posture. But technique matters – a lot.
Ready to build core strength safely?
Contact us today to schedule your assessment with our experienced team.