Hip popping during sit-ups is almost always caused by a tendon sliding over bone as your hip repeatedly flexes and extends. This is called snapping hip syndrome, and it affects roughly 5 to 10% of the population. The majority of people who experience it have painless snapping, meaning the sound and sensation are annoying but not harmful.
Sit-ups are a particularly common trigger because they require rapid, repetitive hip flexion under load. Understanding which structures are involved can help you decide whether to push through, modify your routine, or get it checked out.
What’s Actually Happening Inside the Joint
There are two main types of snapping hip, and the type you have depends on which tendon is doing the sliding.
The more common culprit during sit-ups is the hip flexor tendon (the iliopsoas). This thick tendon runs from your lower spine across the front of your hip joint. Every time you curl upward in a sit-up, the tendon tightens and can catch on a bony bump at the front of your pelvis. When it snaps back into place, you feel (and sometimes hear) a pop or click deep in the front of your hip. This is called internal snapping hip.
The other type involves the IT band, a long strip of connective tissue running down the outside of your thigh. When this band slides over the bony point on the side of your hip during movement, it creates a snapping sensation on the outer hip. This is external snapping hip, and while it’s more commonly triggered by running or cycling, some people notice it during sit-ups too.
A third, less common cause is something loose inside the joint itself, like a small cartilage tear or a piece of torn tissue catching during movement. This type typically feels different: more of a catching or locking sensation, often accompanied by a sharp pinch in the groin.
Why Sit-Ups Trigger It
Sit-ups demand a lot from your hip flexors. As you curl your torso up, the hip flexor muscle contracts hard to anchor your legs to the ground and pull your trunk forward. That repeated shortening and lengthening under tension is exactly the motion that causes the tendon to ride over bone. The faster or more forcefully you do your reps, the more pronounced the snapping tends to be.
Muscle imbalances play a significant role. People with internal snapping hip often have weakness in the gluteus medius, the muscle on the side of the hip that stabilizes the pelvis. When this muscle is weak, the hip flexor compensates by staying overly active, increasing the tension on the tendon and making it more likely to snap. In many cases, the hip flexor isn’t just tight in the traditional sense. It’s failing to relax properly during the lengthening phase of the movement, essentially gripping when it should be releasing.
For external snapping hip, the imbalance is typically between the gluteus maximus and the tensor fasciae latae, a small muscle at the front-side of the hip that feeds into the IT band. When the glutes aren’t firing well, the IT band tightens and is more likely to catch.
When Popping Is Harmless
If the pop happens consistently in the same spot, doesn’t hurt, and you can reproduce it on command, it’s very likely benign snapping hip. You might feel the tendon shift, hear a dull thud, or notice a visible snap at the front or side of your hip. None of this, on its own, signals damage.
Young adults and teenagers are especially prone to painless snapping because rapid growth can leave muscles and tendons temporarily tight relative to the skeleton. Athletes, dancers, and anyone who does a lot of hip-dominant movement also experience it at higher rates simply because they’re putting those structures through more repetitions.
Signs That Deserve Attention
The pop becomes more concerning when it’s accompanied by pain, particularly a deep ache or sharp pinch in the groin. Other symptoms worth noting include a catching or locking sensation where the hip feels stuck mid-movement, pain that gradually worsens over weeks of continued exercise, swelling around the hip, or weakness that makes it hard to lift your leg against resistance. These can point to irritation of the tendon itself (tendinitis from the repeated snapping), inflammation of the fluid-filled sac near the joint (bursitis), or a tear in the ring of cartilage that lines the hip socket.
Fixing the Underlying Tightness
Since snapping hip is fundamentally a problem of tendon tension and muscle imbalance, the fix starts with addressing both. A stretching and strengthening routine targeting the right muscles resolves the issue for many people without any other intervention.
Stretch the Hip Flexor
A half-kneeling hip flexor stretch is one of the most effective options. Kneel on one knee with the other foot flat in front of you, both knees at about 90 degrees. Gently shift your weight forward while keeping your torso upright and your core engaged. You should feel a stretch at the front of the hip on the kneeling side. Hold for 30 seconds and repeat two to three times per side. The key is consistency: do this daily, not just before workouts.
Spending time lying face-down (prone) for a few minutes each day can also help. This position gently extends the hip and discourages the shortened, flexed position that many people hold from sitting at a desk all day.
Strengthen the Glutes
Because gluteus medius weakness is so commonly linked to internal snapping hip, targeted glute work is essential. Glute bridges are a good starting point: lie on your back with knees bent, tighten your core, and lift your hips until they form a straight line from knees to shoulders. Hold for three deep breaths, lower, and repeat for 12 to 15 reps. Side-lying leg raises and clamshell exercises specifically target the gluteus medius and help restore balance between the hip flexors and the muscles on the back and side of the hip.
Retrain the Hip Flexor to Relax
This is the piece many people miss. If the hip flexor is staying overly active rather than just being structurally short, stretching alone won’t solve it. Slow, controlled movements that require the hip flexor to lengthen under control can help retrain that pattern. Think slow leg lowers from a 90-degree position, taking three to four seconds to lower each leg while keeping your core braced and your lower back flat.
Core Exercises That Skip the Pop
If sit-ups consistently trigger snapping and you’d rather avoid it while you work on the underlying issue, several core exercises deliver similar or better abdominal strengthening without heavy hip flexor involvement.
- Modified crunches: Lie on your back with your feet flat on a wall, knees and hips at 90 degrees. Cross your arms over your chest and lift just your head and shoulders off the floor. This shortens the range of motion enough to keep the hip flexors mostly out of the equation.
- Bridges: These strengthen the glutes and core simultaneously without any hip flexion snap risk. Focus on keeping your hips level and avoiding arching your lower back at the top.
- Dead bugs: Lie on your back with arms extended toward the ceiling and knees bent at 90 degrees. Slowly extend one arm overhead and the opposite leg toward the floor, then return. This challenges core stability without the repetitive hip flexion that triggers popping.
- Planks: A standard plank holds the hip in a neutral position, training the deep core muscles without any snapping motion.
What Happens if You Ignore It
Painless snapping that you leave alone generally stays painless. Many people live with it for years with no progression. The risk of ignoring it is that repeated snapping can, over time, irritate the tendon or the bursa near the joint, turning a painless click into a painful one. If you notice the snapping becoming uncomfortable or if it starts affecting your performance, that’s a reasonable time to address it more seriously.
Conservative approaches like physical therapy, activity modification, and stretching are the first line of treatment. Among people with pre-arthritic hip pain who tried conservative care, nearly half did not progress to surgery at a minimum one-year follow-up, suggesting that non-surgical management works well for a large proportion of hip issues. For isolated snapping hip without structural damage, the success rate of conservative care is even higher.