Why do my hamstrings cramp during single-leg glute bridges?

Usually because the foot is planted too far from the hips, which makes the hamstrings do much of the lifting. In a study of healthy young adults, walking the foot in until the knee was bent to about 135 degrees cut biceps femoris activity from about 75% to about 23% of a maximal contraction, while gluteus maximus and medius activity stayed similar. Move the foot a little closer to the buttock and squeeze the glute before you lift.

Should I keep my foot flat or lift my toes?

Keep the whole foot flat unless you have a reason to change it. In a study of healthy adults holding one-leg bridges, lifting the toes so only the heel stayed down lowered hamstring activity and, in the version with the other leg held straight, raised inner-thigh (adductor) activity, but it did not change glute activity. So a heel-only position shifts work among the thigh muscles rather than adding glute work.

How is the single-leg glute bridge different from a single-leg hip thrust?

In the glute bridge your shoulders stay on the floor, so the hips travel a short distance and the exercise is easier. The Bodyweight Single-Leg Hip Thrust puts the upper back on a bench, which lets the hips sink lower and extend through a longer range, so it is the natural next step.

Should the raised leg be straight or pulled toward the chest?

Both are common. Holding the raised leg straight, as shown here, makes a longer lever that is harder to keep level; pulling that knee toward the chest and holding it there makes it harder to arch the lower back, and suits anyone whose back takes over. Pick one version and keep it the same from set to set so your progress is comparable.

Single-Leg Glute Bridge

What Is the Single-Leg Glute Bridge?

Single-Leg Glute Bridge is a compound exercise that primarily targets the glutes and hamstrings and also engages the hip stabilizers, lower back and abdominals. It is a beginner-level movement done on the floor with body weight only: one foot stays planted while the other leg is held straight, and the hips rise until the shoulders, hips and working knee form a straight line.

Taking one foot off the floor puts the whole lift on one hip instead of sharing it between both, as the two-leg Glute Bridge does, and it adds a new job. With support on one side only, the pelvis wants to drop and rotate toward the raised leg, so the gluteus medius and the trunk muscles have to hold it level through every rep. That makes the exercise useful both for building hip extension strength one side at a time and for spotting a side that is weaker or less controlled. It often appears in warm-ups, in rehab and return-to-training programs, and in strength sessions for runners and field sport athletes, done for controlled reps or short holds.

Where the foot sits changes who does the work. With the foot planted well away from the hips, the hamstrings take a large share and can cramp; walking the foot in closer shifts more of the effort to the glutes. The floor version also has a short range of motion because the shoulders stay on the ground. Resting the upper back on a bench turns it into the Bodyweight Single-Leg Hip Thrust, which moves the hips through a longer path and is harder, while the Dumbbell Single-Leg Glute Bridge keeps the floor setup and adds load across the hips.

The exercise suits beginners who can already do a steady two-leg bridge, people returning to lower-body training, and athletes who want more single-leg hip strength without a heavy load. If the hips tilt or the lower back takes over, build up with the two-leg Glute Bridge first, or bend the knee of the raised leg to shorten the lever. Because the movement is small and the hamstrings are eager to help, a deliberate squeeze of the working glute at the top matters more here than in most lower-body exercises.

Muscles Worked

MuscleActivation

Biceps Femoris: Primary
Gluteus Maximus: Primary
Gluteus Medius: High
Semimembranosus: High
Semitendinosus: High
Adductor Magnus: Medium
Erector Spinae: Medium
External Oblique: Low
Gluteus Minimus: Low
Rectus Femoris: Low

Instructions

Lie on your back on the floor and cross your arms over your chest, hands resting on the opposite shoulders.
Bend one knee and plant that foot flat on the floor, far enough out that the knee will be bent to about 90 degrees at the top.
Keep the other leg straight along the floor with the toes pointing up.
Brace your abs lightly and squeeze the glute of the working leg.
Press through the whole planted foot and lift your hips, raising the straight leg with them so it stays in line with the working thigh.
Rise until your shoulders, hips and working knee form a straight line, keeping both hips level and your lower back from arching.
Pause for a second at the top and squeeze the working glute.
Lower your hips and the straight leg under control until your hips lightly touch the floor.
Complete all reps on one side, then switch legs.

Common Mistakes

Hips dropping or rotating
Letting the pelvis sag or twist toward the raised leg takes the load off the working glute and hands it to the lower back.
Arching the lower back at the top
Driving the hips higher than a straight line from shoulders to knee extends the lumbar spine instead of the hip.
Foot too far from the hips
Planting the working foot far out makes the hamstrings do most of the lifting and often leads to cramping.
Swinging the raised leg
Kicking the straight leg up to build momentum, or letting it sag during the rep, turns a controlled lift into a bounce.
Stopping short
Lowering again before the hip is fully extended leaves out the top of the range, the part of the lift the exercise is built around.

Injuries

Single-Leg Glute Bridge is a low risk exercise when performed with proper technique. It uses body weight only, starts from the floor and has a short range of motion, so the main problems come from how the top position is reached rather than from the load.

The lower back is the most common strain point. Pushing the hips higher than a straight line from shoulders to knee arches the lumbar spine instead of extending the hip, which can leave the back achy rather than the glute tired. A light abdominal brace with the ribs kept down, and stopping at the straight line, prevents it. The working hamstring can also cramp, especially when the foot is planted far from the hips; moving the foot closer usually settles it. Letting the pelvis drop or twist toward the raised leg puts uneven stress on the lower back and sacroiliac region, so the hips should stay level on every rep.

If the pelvis will not stay level, go back to the two-leg Glute Bridge, or keep one leg lifted but with its knee bent to shorten the lever. Once 12 to 15 steady reps per side feel easy, progress to the Dumbbell Single-Leg Glute Bridge, the Bodyweight Single-Leg Hip Thrust or the Bodyweight Feet-Elevated Single-Leg Hip Thrust.

Stop the set if you feel sharp pain in the lower back, pain at the front of the hip, or a pulling pain in the hamstring rather than muscle fatigue. A cramp that returns even after the foot is moved closer is a sign to rest and try again another day, not to push through.

Overview

Primary Focus: Glutes and hamstrings
Equipment: Body weight
Modality: Strength
Difficulty: Beginner

Alternative Exercises

Frequently Asked Questions

Q: Why do my hamstrings cramp during single-leg glute bridges?: Usually because the foot is planted too far from the hips, which makes the hamstrings do much of the lifting. In a study of healthy young adults, walking the foot in until the knee was bent to about 135 degrees cut biceps femoris activity from about 75% to about 23% of a maximal contraction, while gluteus maximus and medius activity stayed similar. Move the foot a little closer to the buttock and squeeze the glute before you lift.
Q: Should I keep my foot flat or lift my toes?: Keep the whole foot flat unless you have a reason to change it. In a study of healthy adults holding one-leg bridges, lifting the toes so only the heel stayed down lowered hamstring activity and, in the version with the other leg held straight, raised inner-thigh (adductor) activity, but it did not change glute activity. So a heel-only position shifts work among the thigh muscles rather than adding glute work.
Q: How is the single-leg glute bridge different from a single-leg hip thrust?: In the glute bridge your shoulders stay on the floor, so the hips travel a short distance and the exercise is easier. The Bodyweight Single-Leg Hip Thrust puts the upper back on a bench, which lets the hips sink lower and extend through a longer range, so it is the natural next step.
Q: Should the raised leg be straight or pulled toward the chest?: Both are common. Holding the raised leg straight, as shown here, makes a longer lever that is harder to keep level; pulling that knee toward the chest and holding it there makes it harder to arch the lower back, and suits anyone whose back takes over. Pick one version and keep it the same from set to set so your progress is comparable.