Many popular abdominal exercises can place unwanted stress on the lower back and neck, especially when performed with poor form or for too long. Choosing back-friendly core modifications helps you build strength and stability while protecting your spine. This guide walks through safer swaps for common moves, stability exercises with gentler options, and key cues to keep your low back happy during training.
Why Some Ab Exercises Can Strain Your Back
According to ACE fitness expert Shana Verstegen, exercises like sit-ups can place large amounts of stress on the lower spine and neck and do not target the deep abdominal muscles such as the transverse abdominis. A study by spinal biomechanics professor Dr. Stuart McGill found that bent- and straight-leg sit-ups placed more than 674 pounds of strain on the lower spine, which can lead to herniated discs and nerve damage. Similarly, back extension machines lock the hips in place, forcing all the stress onto the lumbar spine, and side bends can put uneven pressure on spinal discs. The good news is that you can swap these moves for alternatives that build core strength with a much lower risk of strain.
Safer Swaps for Common Core Moves
ACE’s “Train This, Not That” approach offers replacements that emphasize stability and controlled movement. Each swap is designed to work the same muscle groups while keeping the spine in a safer position.
Replace Sit-Ups With the McGill Curl-Up
Dr. McGill identified the curl-up as one of the “Big Three” exercises that focus on core strength and stability with minimal spinal load. Begin by lying flat on your back with only one knee bent. Place your hands under the small of your back to monitor movement, ensuring your back does not touch the floor. Brace your core muscles as if you were about to be punched in the stomach and lift the head and tops of the shoulders, keeping the spine in neutral. For an added challenge, lift the elbows off the floor. Try this for six to 10 holds, each lasting 10 seconds.
Replace the Back Extension Machine With the Bird Dog
The bird dog is a co-contraction of one leg and the opposite arm in the quadruped position. Start with your hands directly under your shoulders and knees directly under your hips. Find a neutral spine and gently brace the core. Extend one leg and the opposite arm, then sweep the floor with the hand and the knee after each 10-second hold. Repeat four to six times on each side. This exercise trains the body to stabilize the lumbar spine during limb movement, and you can find more detailed form cues in the stability training section.
Replace Side Bends With the Side Bridge (Side Plank)
The side bridge is another of McGill’s “Big Three.” Line your elbow up with the shoulder, and the shoulder up with the hip and heel. With a very tight and braced core, push the ground away from you, staying active in the shoulder joint. Hold for 10 seconds and repeat four to six times. To reduce the intensity, perform this exercise from the knees instead of the feet.
Replace Partner Leg Slams With TRX Resisted Leg Raises
Partner leg throw-downs can cause excessive extension of the spine and may be harmful for the lower back. A much better option, according to ACE, is the TRX resisted straight-leg raise. Lie on the ground facing the anchor point, place both hands in the foot cradles, and press down. While keeping your core braced, slowly lower one or both legs toward the ground until just before the low back raises up. Return to the starting position while keeping pressure down in the hands. Perform two 30-second sets of this exercise.
Replace Long Plank Challenges With Short, Challenging Planks
Planks held for an extended period of time lose their value and result in poor posture. For maximum strength and endurance gains, hold tighter, more active planks for a shorter period of time. With the forearms on the ground and elbows directly under the shoulders, brace every muscle of your body, especially the glutes, and hold a perfectly straight line for 10 seconds on, two seconds off, for four to six sets. If you cannot complete a 10-second plank without the hips sagging, move your knees to the ground. For more plank variations, see our beginner ab exercises.
Core Stability Exercises With Back-Friendly Options
ACE fitness expert Elizabeth Kovar recommends seven core stability exercises that can be added to your routine. Each one comes with an alternate version if the main version feels too challenging or if you do not have the featured equipment. The most important thing to remember when training the core is to avoid using momentum and instead perform each exercise with awareness so that the core muscles are engaged.
BOSU Bird Dog
Set your left knee on the center of the dome and place both hands on the floor underneath the shoulders. Extend the right leg behind you to hip height, keeping the foot flexed. Raise the left arm to shoulder height with your thumb facing the ceiling. Hold for 20 seconds and switch sides. Alternate version: perform the exercise on the floor.
Supine Heel Taps
Lie on your back and place your arms by your sides. Engage the abdominals and draw the navel toward your spine. Lift the knees to 90 degrees. With control, lower your right foot to touch the floor with your heel before returning it back to 90 degrees. Perform the same movement with your left leg and continue to alternate tapping the right and then the left heel onto the floor. Perform 10 repetitions with each leg. Each repetition should take about four seconds to complete, two seconds to lower the leg and two seconds to raise the leg back to 90 degrees. Alternate version: keep your feet on the floor, and slide your heel on the mat, alternating legs.
Marching Glute Bridge
Lie on your back and place your hands by your sides. Lift the hips and hold a glute bridge. Lift the right foot off the floor to 90 degrees at the hip and knee. Return the foot to the floor and then lift the left foot to 90 degrees; return to center. Keep the hips lifted and maintain a neutral pelvis as you alternate leg lifts for 20 repetitions. Alternate version: hold a static glute bridge, keeping both feet on the floor for 30 or more seconds.
Stability Ball Dead Bug
Lie on your back and lift your knees to 90 degrees. Place a stability ball at the knees and press your hands and legs into the stability ball. Engage the core muscles and draw the navel toward the spine. Extend the left arm and right leg while continuing to hold the ball with your left leg and right hand. The straighter the limbs, the more challenging the exercise. Make sure the knees stay at 90 degrees when returning back to center. Complete 10 repetitions on each side, alternating which arm and leg are extended with each repetition. Alternate version: perform the exercise without a stability ball and keep your knees at 90 degrees as you lower. It is similar to the Supine Heel Taps exercise described above, but with the addition of the arms.
Forearm Plank With Toe Taps
Position the body into a forearm plank with the arms resting on the dome side of a BOSU balance trainer. Begin alternating lateral toe taps, where the right foot pushes away from the body, touches the floor and then returns to center. Repeat with the left leg. Complete a set of 10 repetitions on each leg. Alternate version: perform a static forearm plank with feet hip-distance apart and the forearms on the floor.
Side Plank With Torso Rotation
Position the body into a forearm side plank with both legs extended. Lift the top arm over the chest and then rotate with your rib cage to draw the hand underneath the ribs. Repeat this motion for 10 to 12 repetitions and then perform on the other side. Alternate version: perform the exercise in modified side plank with your bottom shin on the floor.
Single-Leg Deadlift
Hold a set of dumbbells and stand tall with feet hip-distance apart. Lift the right foot off the floor and hinge the pelvis to glide over the top of the left leg. The head and the foot should counterbalance each other. The lowest hinging point should be when the body is parallel to the floor. Keep the pelvis as neutral as possible. Complete 12 repetitions on each leg. Alternate version: perform the exercise without dumbbells or complete a deadlift with both feet on the floor.
Key Cues for Bird Dog and Glute Bridge
Two foundational exercises that appear in back-friendly programming are the bird dog and the glute bridge. The ACE Exercise Library provides specific steps to keep the low back safe.
Bird Dog Low Back Cues
Start on an exercise mat with knees and feet hip-width apart, feet dorsi-flexed. Place your hands directly under your shoulders. Stiffen your core and abdominal muscles to position your spine in a neutral position, avoiding any excessive sagging or arching. As you extend the opposite arm and leg, only raise the limbs to heights where the low back position can be maintained. The degree of hip extension and shoulder flexion is determined by your ability to control against movement in the low back. Using a light bar placed across the hips or shoulders can provide visual feedback to any rotation. Never exceed your body’s capacity to control movement in the low back.
Glute Bridge Low Back Cues
Lie on your back in a bent-knee position with feet flat on the floor and hip-width apart. Gently contract your abdominal muscles to flatten your low back into the floor and attempt to maintain this gentle muscle contraction throughout the exercise. As you press your hips upward by contracting your glutes, avoid pushing your hips too high, as this generally increases the amount of hyperextension in your low back. Press your heels into the floor for more stability. To progress, you can extend one leg while in the raised position, but avoid arching your lower back by keeping your abdominal muscles engaged throughout the lift. For more form guidance, visit our exercise form section.
When to Be Cautious: Back Pain and Exercise
Core training is not a treatment for back pain. The NHS advises that back pain, particularly lower back pain, is very common and usually improves within a few weeks. However, there are times when you should seek medical advice. If you have back pain, an injury, are pregnant, have had recent surgery, or have a health condition, check with a doctor or physical therapist before starting any new exercise. Stop immediately if an exercise causes pain.
According to the NHS, you can try self-care measures to ease back pain: stay active and continue with your daily activities, take anti-inflammatory medicine like ibuprofen (check with a pharmacist or GP if unsure), use an ice pack wrapped in a tea towel to reduce pain and swelling, and use a heat pack wrapped in a tea towel to relieve joint stiffness or muscle spasms. Do not stay in bed for long periods. The NHS also recommends specific exercises and stretches for back pain, but stop if your pain gets worse and see a GP for advice.
See a GP if your back pain does not improve after treating it at home for a few weeks, stops you doing your day-to-day activities, you are worried about the pain or struggling to cope, you have lost weight without trying, there is a lump or swelling in your back or your back has changed shape, the pain does not improve after resting or is worse at night, it is worse when sneezing, coughing or pooing, or it is coming from the top of your back rather than your lower back.
Ask for an urgent GP appointment or get help from 111 if you feel hot, cold, shivery or generally unwell, or the pain is severe and starts suddenly or gets worse quickly. Call 999 or go to A&E if you have back pain with pain, tingling, weakness or numbness in both legs, a loss of feeling around your genitals or anus, changes in your bladder or bowels, changes in how your penis or vagina feels during sex, not being able to get or keep an erection or not being able to orgasm, chest pain, or if the pain started after a serious accident such as a car accident.
If your back pain is severe or not getting better, treatments may include group exercise sessions and physiotherapy, manual therapy, cognitive behavioural therapy (CBT), a procedure to seal off some of the nerves in your back, or surgery for specific conditions like a slipped disc. For more on safe core training practices, explore our core exercise technique and safety guide.
Frequently asked questions
Can I do ab exercises if I have back pain?
If you have back pain, the NHS recommends staying active and trying exercises and stretches, but stop if your pain gets worse and see a GP for advice. Before starting any new core routine, check with a doctor or physical therapist, especially if you have an injury or a health condition. Choose back-friendly modifications like the McGill curl-up, bird dog, or side bridge, and avoid movements that cause pain.
How long should I hold a plank to protect my back?
ACE advises against holding planks for extended periods, as they lose their value and can lead to poor posture. Instead, perform shorter, more active planks: hold a perfectly straight line for 10 seconds on, two seconds off, for four to six sets. If your hips sag, drop to your knees. This approach builds strength and endurance without overloading the spine.
What is the safest core exercise for a sensitive back?
The bird dog and the McGill curl-up are both designed to build core stability with minimal spinal load. The bird dog teaches the body to stabilize the lumbar spine during limb movement, and ACE describes the curl-up as differing from a crunch in that the lumbar spine should not move. Always use the cues from the ACE Exercise Library: keep a neutral spine, brace the core, and only move within a range where the low back stays controlled.
For more back-friendly modifications and technique tips, visit our Back-Friendly Modifications section.
