If you have lower back pain, the exercises most likely to make it worse are those that compress your spine under load or repeatedly bend it forward: traditional sit-ups, standing toe touches, heavy deadlifts, and double leg lifts. But the full list depends on what type of movement triggers your pain, because not everyone’s back hurts for the same reason.
Sit-Ups, Crunches, and Toe Touches
These are the most common culprits. Every time you curl your torso forward, the pressure inside your spinal discs rises sharply. Measurements taken directly inside lumbar discs show that relaxed standing produces about 0.5 megapascals of pressure, while bending forward roughly doubles it to 1.1 MPa. Sit-ups repeat that forward-bending motion over and over, grinding into discs that may already be irritated or bulging. Toe touches combine forward bending with a straightening action and, if you’re holding any weight, the loads climb even higher.
The issue isn’t that your spine can’t flex. It’s that doing it repetitively under load, especially when tissues are already inflamed, accelerates damage rather than building strength. If you’ve been doing crunches to “strengthen your core” for back pain, you’re likely working against yourself.
Double Leg Lifts and Lying Leg Raises
Lying flat and lifting both legs at once looks like a core exercise, but most of the work shifts to your hip flexors, which attach directly to your lumbar spine. When those muscles pull hard against a weak or painful lower back, they drag the spine into an exaggerated arch. This compresses the small joints at the back of each vertebra, exactly where many people already have irritation. Single leg raises with the opposite knee bent are a far safer way to work the same muscles without overloading your spine.
Heavy Deadlifts and Olympic Lifts
Deadlifts place enormous compressive force on the lower lumbar spine, particularly at the L5 vertebra. Research on competitive lifters has recorded compressive loads between 5,000 and 18,000 newtons and shear forces up to 3,276 newtons at L5 during heavy pulls. To put that in perspective, the compressive load scales from roughly 1 newton per kilogram of body weight at the start of the lift to 10 to 15 newtons per kilogram at the top.
The risk goes up considerably when form breaks down. A fatigued lifter’s trunk tends to round forward, and that posture shift forces the muscles and ligaments of the lower back to work even harder to keep the spine stable. Hang cleans and snatches carry similar concerns: they combine bending, compression, and rapid extension in a way that can injure discs, muscles, and ligaments simultaneously. If you’re currently in pain, these lifts should be shelved until you’ve rebuilt baseline stability.
High-Impact Activities
Running, jumping, and plyometric training send repeated shock waves through your spine. Each foot strike during running transmits force upward through the pelvis and into the lumbar vertebrae. For someone with an irritated disc or inflamed joint, that repetitive impact can keep the pain cycle going even if the activity doesn’t feel especially strenuous. Sports that combine impact with rotation, like tennis, racquetball, and golf, add twisting forces on top of compression, which is a particularly aggressive combination for an unhappy lower back.
This doesn’t mean you can never run again. It means that during an active flare, switching to low-impact movement like walking, swimming, or cycling lets you stay active without hammering inflamed tissues.
How to Tell Which Movements Are Your Triggers
Not all lower back pain responds to the same restrictions. Pain that worsens when you bend forward, round your back, or sit slumped for long periods is called flexion-sensitive. This is the most common pattern, and it’s the one that makes sit-ups, toe touches, and rounded-back lifting especially problematic. Disc pressure measurements confirm this: sitting in a fully flexed position nearly doubles disc pressure compared to sitting upright, jumping from 0.46 MPa to 0.83 MPa.
Extension-sensitive pain, on the other hand, flares when you arch backward, lie on your stomach with your back sagging, or stand for long periods. If this describes you, exercises like the Superman (lying face down and lifting your arms and legs) or deep backbends can aggravate your symptoms even though they’re sometimes recommended for general back health.
A simple way to figure out your pattern: pay attention to which positions give you relief. If leaning back or standing tall feels better, you’re likely flexion-sensitive. If rounding forward or sitting takes the edge off, you may be extension-sensitive. The exercises you avoid should match the movement direction that provokes your pain.
Lifting Technique Matters as Much as Exercise Choice
Even everyday lifting can spike spinal loads dramatically if your form is off. Picking up a 20-kilogram object (about 44 pounds) with a rounded back generates 2.3 MPa of disc pressure. Bending your knees drops that to 1.7 MPa, and holding the object close to your body brings it down to 1.1 MPa, less than half the rounded-back value. That’s the difference between aggravating a disc and keeping it safe.
The practical takeaway: hinge at your hips, keep your back in its natural curve, bend your knees, and pull the load close before standing. This applies whether you’re in the gym or picking up a bag of groceries.
What to Do Instead
Avoiding certain exercises doesn’t mean avoiding exercise altogether. Staying sedentary with back pain generally makes things worse, not better. The goal is to train your core to stabilize your spine without loading it heavily. Three exercises designed specifically for this purpose, sometimes called the McGill Big Three, have strong evidence behind them.
- Modified curl-up: Lie on your back with one knee bent and your hands under the small of your back. Lift just your head and shoulders a few inches off the floor, keeping your lower back in its natural curve. This trains the front abdominal muscles without the full spinal flexion of a sit-up.
- Side bridge (side plank): Prop yourself on your forearm and the side of your knee (or feet for more challenge). This targets the muscles along the side of your trunk, which are critical for spinal stability but nearly impossible to train with sit-ups or crunches.
- Bird-dog: From hands and knees, extend one arm forward and the opposite leg back, keeping your torso completely still. This trains the front and back muscles of the trunk together, building coordination without placing load on the spine.
Studies on people with chronic nonspecific lower back pain found that these stabilization exercises improved pain, functional ability, and range of motion. The key principle behind them is increasing stiffness and coordination around the spine rather than simply building raw strength or flexibility, which is why they work better for back pain than conventional core routines.
Reintroducing movements that bend or load the spine is actually important for long-term recovery. The point isn’t to avoid flexion forever. It’s to avoid it during the acute phase, rebuild stability, and then gradually return to full movement so your back becomes more resilient, not more fragile.
Signs Your Back Pain Needs Medical Attention
Most lower back pain improves with activity modification within a few weeks. But certain symptoms alongside back pain indicate a serious nerve problem that exercise alone won’t fix. Numbness in the groin, buttocks, or inner thighs (sometimes called saddle numbness) can become permanent without prompt treatment. Weakness in a leg that causes stumbling or a foot that slaps the ground when you walk suggests nerve compression that’s progressing. Loss of bladder or bowel control, whether that means incontinence or an inability to go, is the most urgent red flag. Any of these paired with back pain warrants immediate medical evaluation, not just a modified workout.