Fire hydrants — how to do them and the benefits for sculpting your glutes, hips, and core

a photo of a woman doing the fire hydrant exercise
(Image credit: Shutterstock)

If you’re looking to work your legs without reaching for the best adjustable dumbbells, or a kettlebell or two, fire hydrants are a good place to start. The move might look (and sound) a little odd, but it does a good job of strengthening your glutes, hips, and core muscles, without the need for weights. Read on to find out how to do a fire hydrant and the benefits for your body. 

As a reminder, if you’re new to exercise, or you’re returning to exercise following an injury or pregnancy, it’s a good idea to check in with your doctor first and chat with a personal trainer, before adding a new exercise to your routine. This exercise is relatively well suited for beginners, and pregnant women, as it doesn’t involve lying on your back, but as always, it needs to be done with the correct form to work the targeted muscles. If in any doubt, always ask a personal trainer to check your form. 

How to do fire hydrants 

Let’s start with how to do fire hydrants with the perfect form:

an illo of a man doing the fire hydrant exercise

(Image credit: Shutterstock)
  • Start off on all fours, palms flat on the ground, arms straight, and knees under your hips (this is known as tabletop).
  • You should be looking down at the floor. Your starting position is crucial, so be sure your back is straight and your core is engaged.
  • With your weight evenly distributed between both hands, raise your left leg to the side, keeping your knee at a right angle. How far you can raise your leg will depend on fitness, flexibility, and strength. Aim to raise it to at least an angle of 45 degrees but if you are in good shape and flexible, you may be able to get your thigh almost parallel with the floor.
  • Hold for a second and lower. That’s one rep. Start off with 10-20 reps on each side and move up to three sets. Do not strain and stop if you feel any discomfort.

Fire hydrants: What are the benefits? 

As mentioned above, this simple-sounding bodyweight exercise works on your glute and hip strength, as well as engaging your abdominal muscles, which have to work to hold your torso stable in the move. It’s important to keep your core and pelvis stable during the exercise — the movement should be coming from your glute muscle, not your pelvis. 

The fire hydrant exercise helps improve hip mobility by working on all of the major hip movements — extension, rotation, and abduction (moving your leg away from your body). It can help tone and sculpt the glute muscles, which can, in turn, lower your risk of injury, and help improve your posture. 

Fire hydrants: Form mistakes to look out for 

It can be difficult to know when you’re not doing an exercise correctly, so here’s the form mistakes to watch out for when practicing fire hydrants: 

Rocking your hips from side to side: As mentioned above, your pelvis should stay still during this exercise. Think about engaging your core — sucking your belly button in towards your spine, and squeeze your glute as you lift your leg. 

Jerking the leg up and down: The key to this exercise is moving slowly, and with control. Jerking your knee up and down too quickly will minimize the effectiveness of the exercise, and mean your glutes won’t be working as hard. 

Fire hydrants: Variations to try 

If you’ve mastered the fire hydrant and you’re looking to up the intensity, here are a few variations to try: 

Ankle weight fire hydrants

As you might have guessed, this modification involves strapping a pair of the best ankle weights around your ankles to increase the resistance. If you’re new to exercising with ankle weights, don’t go too heavy too quickly — you’d be surprised by how much harder they make the exercise.

Resistance band fire hydrants

Adding a small loop resistance band to your legs during this exercise forces your glutes and hips to work harder against the resistance. To do this, grab one of the best resistance bands and loop it above your knees. 

Fire hydrant pulses

To do this exercise, complete the fire hydrant as normal, but at the top of the movement, with your knee lifted to the side of your body, pulse your knee up a few inches, then lower it. Complete a few of these pulses, before lowering your knee back down towards the ground. This increases the time your glute spends under tension, making the move harder without having to use extra equipment. 

Fire hydrant kicks

For fire hydrant kicks, complete the fire hydrant as normal, but once your leg is lifted, extend it out and away from the body. Reverse the movement so you have a 90-degree bend in your knee, and lower your leg to finish one rep. This variation further works the muscles on the side of the hip. 

Standing fire hydrants

Finally, if you have wrist pain or mobility issues that make working on all fours difficult, you might prefer to do a standing variation of this exercise. Here’s how to do it: 

  • Start by standing on an exercise mat with your feet hip-width apart.
  • Bend one knee to 90 degrees and lean your trunk forward, engaging your core.
  • Lift your leg to 45 degrees without moving the rest of your body.
  • Lower your leg to your starting positon, but don’t remove the bend in your knee. That’s one rep.
  • Complete all your reps on one side before switching.

More from Tom's Guide

Jane McGuire
Fitness editor

Jane McGuire is Tom's Guide's Fitness editor, which means she looks after everything fitness related - from running gear to yoga mats. An avid runner, Jane has tested and reviewed fitness products for the past five years, so knows what to look for when finding a good running watch or a pair of shorts with pockets big enough for your smartphone. When she's not pounding the pavements, you'll find Jane striding round the Surrey Hills, taking far too many photos of her puppy. 

Read more
Woman performing a crunch with her hands behind her head during lower abs workouts
Forget crunches, and try horizontal ab squats to build a strong core and hip flexors instead
Woman kneeling with hands on hips at the gym studio in activewear
You just need 1 minute and this bodyweight exercise to transform your squats and boost lower-body mobility
a photo of a woman doing a glute bridge
I did 100 butterfly glute bridges every day for two weeks — here’s what happened to my lower body
a photo of a woman doing a squat
Skip the gym! This strong legs and glute burner workout sculpts your lower body in 12 moves
a woman's abs
Forget weights — Pilates instructor shares 7 moves to strengthen your abs and glutes
Woman doing lateral walking with a resistance band in an apartment
I did banded lateral walks every day for a week — here’s what happened to my glutes and lower body
Latest in Fitness
Man in a low squat with arms extended at shoulder height during gorilla walk exercise
Mobility coach shares 'squat like a baby' routine to boost lower-body flexibility and improve hip health
a photo of a woman with strong abs
I tried this 7-minute intense core workout — here’s what happened to my abs
Left image Jordan Chiles, right image Simone Biles both competing in gymnastics
I tried Olympic Champion gymnast Simone Biles’ ab workout — here’s what happened to my core
Close-up photo of the black version of Samsung's Galaxy Ring held between thumb and index finger in front of a garden.
Samsung patent suggests a future Galaxy Ring will include a temperature sensor — here's how it could work
a woman's abs
Forget sit-ups — build core strength and boost your mobility in just 15 minutes with this Pilates routine
a photo of a woman wearing gym kit standing in front of a blue sky
3 moves, no equipment — a Pilates instructor says these exercises are key to boosting energy and full-body mobility
Latest in How To
What size air purifier do you need? We ask the experts
ChatGPT on iPhone
5 mind-blowing ChatGPT prompts you’ll wish you knew sooner
Bulbs on a planting table
7 bulbs to plant in March for the best summer blooms
iRobot Roomba Combo 10 Max on hardwood floor
Don’t let your Roomba overflow — here's how to empty it
Roomba i3
How to clean your Roomba for peak performance — 5 easy steps
Golfer Xander Schauffele take a swing ahead of the Arnold Palmer Invitational PGA 2025 golf tournament
How to watch Arnold Palmer Invitational 2025: live stream PGA Tour golf online, TV channel, schedule