Straight Leg Kickback
What Is the Straight Leg Kickback?
Straight Leg Kickback is an isolation exercise that primarily targets the glutes and also engages the hamstrings. It is a beginner-level movement performed on all fours with no equipment, in which one leg drives straight back from the hip until it lines up with the torso.
Its job is to train hip extension one leg at a time. That makes it a common pick for glute warm-ups before lower body training, for home and bodyweight workouts, and as a finisher at the end of a leg session. Because each side works alone, it also makes a difference in glute control between the left and right side easy to see.
Keeping the knee straight is what sets it apart from the Bent Leg Kickback. With the knee extended, the hamstrings stay long enough to help extend the hip, so they share more of the work with the gluteus maximus, and the straight leg is a longer lever that makes the same bodyweight lift noticeably harder. Bending the knee shortens the hamstrings and shifts a larger share of the hip extension to the glutes. Since gravity is the only load, the effort is greatest near the top, where the leg is level with the body, and it eases as the leg lowers, so a short pause at the top is where the glute does the most work.
It suits beginners, people returning to training and anyone who wants glute work without a bar on their back. If holding the hips level with a straight leg is too hard, start with the bent leg version or a Glute Bridge. It can be done using just body weight, or with added resistance like ankle weights, resistance bands, or cable attachments to increase difficulty.
Muscles Worked
- Gluteus Maximus
- Primary
- Biceps Femoris
- High
- Gluteus Medius
- High
- Gluteus Minimus
- Medium
- Semimembranosus
- Medium
- Semitendinosus
- Medium
- External Oblique
- Minimal
Instructions
- Start in an all-fours position on the floor, with your hands under your shoulders and knees under your hips.
- Brace your core so your back is flat, and keep your neck in line with your spine with your eyes on the floor.
- Push one leg back and up from the hip, straightening the knee as it travels until the whole leg is straight.
- Stop when the leg is in line with your torso or slightly above it, and squeeze your glute for a second.
- Keep your hips square to the ground and avoid arching your lower back or rotating your hips as you lift your leg.
- Lower the leg with control, bringing the knee back under your hip without resting it on the floor.
- Perform all reps on one side, then switch to the other leg.
Common Mistakes
Arching the lower back
Letting the back sag reduces glute activation and increases the risk of lower back strain.
Kicking too high
Lifting the leg well above the line of the torso can only come from arching the lower back, so the extra height adds strain rather than glute work.
Swinging the leg
Using momentum rather than controlled movement limits muscle engagement and increases injury risk.
Rotating the hips
Twisting the pelvis removes isolation from the glutes and shifts stress elsewhere.
Bending the knee at the top
Finishing the lift with a bent knee shortens the lever and reduces the hamstrings' part in the hip extension, turning it into a bent leg kickback.
Injuries
Straight Leg Kickback is a low risk exercise when performed with proper technique.
The most common issue arises when people arch their lower back during the movement, which can strain the lumbar spine. To prevent this, it's important to engage the core and keep the back neutral. The hip only extends a short way past the line of the body, so any height beyond that comes from the lower back rather than the glute. Stop the lift when the leg is level with your torso or just above it.
Knee discomfort may also occur if the surface is too hard. Using a padded mat can help alleviate pressure on the knees and make the position more comfortable during longer sets.
If your lower back takes over or your hips will not stay level, switch to the Bent Leg Kickback, which shortens the lever, or a Glute Bridge. Add a light ankle weight or band only once every rep stays square and controlled. Stop the set if you feel pinching in the lower back, a cramp in the back of the thigh, or pain in the wrists or the knee you are kneeling on.
- Primary Focus
- Glutes
- Equipment
- Body weight
- Modality
- Strength
- Difficulty
- Beginner
Alternative Exercises
Frequently Asked Questions
- Q: Can I use ankle weights for more resistance?
Yes. Because the straight leg is a long lever, even a light ankle weight adds a lot, so start light and add it only once you can keep your hips level and your back flat for every rep.
- Q: How high should I lift my leg?
Just high enough to feel a strong glute contraction - avoid lifting so high that your back arches.
- Q: What is the difference between the straight leg and bent leg kickback?
Keeping the knee straight lets the hamstrings help extend the hip and turns the leg into a longer lever, so this version is harder and spreads the work between the glutes and hamstrings. Bending the knee, as in the Bent Leg Kickback, shortens the hamstrings and shifts a larger share of the hip extension to the glutes.
- Q: How many reps should I do?
Two to three sets of 12 to 15 reps per leg, with a one-second squeeze at the top, is a common starting point. End the set when your hips start to tilt or your back starts to arch rather than chasing a number.
- Q: Is this exercise effective without equipment?
Yes, bodyweight straight leg kickbacks can still be effective, especially when done with focus and control.