How to Do the Kas Glute Bridge for a Serious Butt Workout

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When you have “build a strong and powerful butt” written at the top of your list of fitness goals, tried-and-true glute exercises such as squats, deadlifts, and lunges will likely be the backbone of your workout programming.



While you can perform slow hip thrusts to increase time under tension, the Kas glute bridge may still have a small leg up. As you lower down to the floor in a hip thrust, you'll inevitably lose some tension in the glutes, while the Kas glute bridge has a small enough range of motion that your glutes are under tension throughout the entire movement, says Summers.

Increases Strength with the Option to Add a Load

Both the Kas glute bridge and the traditional glute bridge — which you perform while lying on the floor — are performed with a smaller range of motion than a hip thrust. But unlike the floor-based exercise, the Kas glute bridge can easily be loaded, says Summers. FTR, it is possible to load a basic glute bridge by placing a dumbbell or barbell on the waist, but it’s often difficult to hold in place and can be distracting while powering through reps, she explains. “Doing the Kas glute bridge from a bench, a box, or anything that you’re able to put yourself on makes it much easier to load,” says Summers.


Kas Glute Bridge Muscles Worked

Since the range of motion is shorter in a Kas glute bridge than a hip thrust, you’ll end up using primarily your butt muscles, particularly the gluteus maximus, to extend the hips and lift the barbell up, says Summers. As a result, the exercise helps build strong glute muscles, which are needed to stabilize your pelvis and ensure the proper functioning of your lower body, according to ACE. Specifically, if your glutes are weak, you may compensate with other muscles during movements, such as the hamstrings and quadriceps, which can ultimately lead to injury, according to ACE.

This glute engagement is also a key difference between the Kas glute bridge and traditional hip thrust. "The Kas glute bridge is supposed to just be glutes," says Summers. "…With the hip thrust, because you're adding this element of power and more motion, sometimes people can't actually feel their glutes working — they'll feel their quads and their hamstrings. And they're really just generating power and force through the ground." An isolated Kas glute bridge, however, forces your booty to do the bulk of the work.

That said, your core — which protects the spine — does still get involved in the movement. Specifically, the core provides stability and prevents your lower back from excessively arching, which can lead to back pain and injury, during most exercises. And that includes the moves in which you press weight overhead or have a heavy weight sitting on your body, such as a hip thrust or Kas glute bridge, Laura Miranda, D.P.T., C.S.C.S., a physical therapist in New York, previously told Shape.


Kas Glute Bridge Exercise Variations

Whether you're a hip-thrust newbie, in the mood to tone down your workout, or want to take things up a notch, you can modify the Kas glute bridge accordingly.

Modify with a Standard Glute Bridge

If the Kas glute bridge feels a bit too tough, try performing the move with just your bodyweight or scaling down to a glute bridge on the floor, suggests Summers. Mastering the traditional glute bridge helps you practice the proper pelvic tilting and understand how the hips move, she says. Then, you can progress to a single-leg glute bridge and finally give a Kas glute bridge a shot, she says.

Advance with Weights or a Single-Leg Variation

Once you’ve mastered the Kas glute bridge and are ready for another challenge, you can level up the exercise by adding heavier weights, such as barbells, dumbbells, or kettlebells, into the mix, says Summers. You can also try a single-leg variation, in which you raise one foot off the ground and slightly bend the knee of your lifted leg. While Summers has yet to test this alternative herself, “you can absolutely do a single-leg hip thrust and you can do a single-leg bridge on the ground, so the answer is likely yes, you can do a single-leg Kas glute bridge…just based on biomechanics and how exercises work,” she says. Just remember to focus on extending the hip via the glutes and avoid relying on your lower back to thrust the weight (if you’re using one) up toward the ceiling, she suggests.


Common Kas Glute Bridge Mistakes

Whether you’re doing a traditional glute bridge, basic hip thrust, or the Kas glute bridge, you’ll want to tuck your tailbone and prevent your lower back from arching (aka creating an anterior pelvic tilt) — a common mistake that can end in injury, Hannah Davis, C.S.C.S., a certified personal trainer and the creator of Body By Hannah, previously told Shape. “We want to be extending from the hips and not the lower back,” says Summers.

It's also important to keep your knees in line with your ankles and parallel with your hips, adds Summers. "That's just so you are isolating at the hip and not letting the body move too far," she says, which ensures the exercise targets the glutes.


How to Add the Kas Glute Bridge to Your Routine

When you feel confident and ready to tackle a Kas glute bridge, start with just your bodyweight or a light dumbbell to perfect your form, recommends Summers. “I say this for every exercise, but start light and work your way up,” she says. To get the booty-building benefits, consider incorporating the Kas glute bridge into your programming about once a week, says Summers. “With the Kas bridge, you aren’t going for super heavy — you are going for hypertrophy, so [increasing muscle] strength and growth,” she adds. “I’d recommend anywhere from three to five sets for 10 to 20 repetitions. ” Of course, the exact reps and sets required to see gains will vary from person to person, depending on fitness level, abilities, and goals, so chat with a trainer for individualized guidance.

You'll also want to check in with a professional and take a cautious approach to the Kas glute bridge (and hip thrusts and floor glute bridges, BTW) if you have any spinal, disc, or nerve issues in order to avoid potential injury, says Summers. "It's not that you can't do these things — it's that you have to be really conscious about your positions," she adds. "Doing heavy, heavy hip thrusts, which can very easily throw you out of a good position, is not a good idea. The Kas glute bridge is a bit more focused on the position [re: the movement is more controlled] so it can be a bit safer." That said, there's no harm in playing it safe and speaking with an expert before you tackle the exercise.

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