Muscles worked
What the fire hydrant trains
Tap a muscle to see just that one and what it does in the lift.
Before the first rep
How to set up
- 01
Get on all fours. Kneel on a mat with your hands flat under your shoulders and your knees under your hips, about hip width apart.
- 02
Flat back. Make your back flat like a tabletop, with your head in line with your spine and your eyes on the floor just ahead of your hands.
- 03
Push the floor away. Press lightly through your palms so your upper back is not sagging between your shoulder blades.
- 04
Brace. Tighten your stomach as if someone is about to poke it. This is what keeps your hips level once a leg comes up.
- 05
Band, if using one. For the harder version, put a mini band just above both knees before you get into position.
Step by step
How to do the fire hydrant
- 01
Keep the knee bent. Hold the working knee bent at about 90 degrees for the whole rep, with your foot roughly level with your knee.
- 02
Lift out to the side. Raise the knee out and up to the side, leading with the knee. Aim to bring your thigh up to about hip height, roughly parallel to the floor, but stop lower if your hips start to tip.
- 03
Pause. Hold the top for a second. You should feel it in the side of the hip on the working leg, not in your lower back.
- 04
Lower slowly. Bring the knee back down under control, taking about two seconds, until it lightly touches the mat or hovers just above it.
- 05
Finish the side. Do all your reps on one leg, then switch. Start each set on your weaker side.
Cues to say in your head
- Hips stay square
- Lead with the knee
- Push the floor away
- Pause at the top
- Slow on the way down
Fix these first
Common mistakes
Tipping the hips to get the knee higher
Stop the lift at the point where your hips start to roll. A lower knee with level hips works the side of the hip; a high knee with tipped hips does not.
Leaning onto the support side
A small shift toward the support side is normal, but keep your weight spread across both hands and the support knee. If you have to lean far over to lift the leg, shorten the range.
Arching or sagging the lower back
Brace your stomach and keep your back flat. Sagging moves the work into your lower back.
Swinging the leg up fast
Lift with control, pause and lower slowly. Momentum skips the part of the rep that does the work.
Straightening the knee
Keep the knee bent at about 90 degrees so the movement stays a sideways lift from the hip.
Stay safe
Fire hydrants are low risk, but kneeling on a hard floor can hurt, so use a mat or fold a towel under your knees. If you feel a pinch at the front of the hip, lift through a smaller range or stop for the day. Stop the set when you can no longer keep your hips level, and see a physical therapist or doctor if hip, knee or back pain keeps coming back.
Programming
Sets, reps and how much weight
| Goal | Sets | Reps | Load | Rest |
|---|---|---|---|---|
| Muscle | 2 to 4 | 12 to 15 per side | 60–67% 1RM | 45 to 90 sec |
| Endurance | 2 to 3 | 15 to 25 per side | 40–55% 1RM | 30 to 60 sec |
| Technique | 1 to 2 | 8 to 12 per side | 30–50% 1RM | 30 sec |
Plan your next session
Put in a recent set. You get working weights for your goal, a warm-up and the plates to load.
Estimated 1RM 216 lb
Endurance sets
86–119lb
2 to 3 sets of 15 to 25 per side reps, 30 to 60 sec rest. Bodyweight or a light band. Keep the pause at the top on every rep.
Estimates use the Epley formula and work best from sets of 3 to 8 reps. Treat them as a starting point and adjust by how the first working set moves.
Questions
Fire Hydrant questions
What muscles do fire hydrants work?
Mainly the gluteus medius on the side of your hip, helped by the gluteus minimus and the upper part of the gluteus maximus. Your abs and obliques work to keep your hips level and your back flat.
Are fire hydrants good for glutes?
Yes, they are a good way to train the side of the glutes with no equipment. As a light isolation move they tend to do less for overall glute size than heavier lifts, so pair them with a hip extension lift like a bridge, hip thrust or squat.
How many fire hydrants should I do?
Two to four sets of 12 to 15 reps per side works well for most people. If you can do 20 or more with level hips and a pause, add a mini band.
How high should I lift my knee?
Aim for your thigh to reach about hip height, roughly parallel to the floor, as long as your hips stay level. If they start to tip before that, stop lower: a smaller range with level hips works better.
Why do I feel fire hydrants in my lower back?
Usually because your back is sagging or your hips are rolling to get the knee higher. Brace your stomach, keep your back flat and lift through a smaller range.
Can I do fire hydrants every day?
Light bodyweight sets as part of a warm-up are fine most days. If you use a band and push sets hard, two or three times a week is plenty.
Train in Protocol
Log your fire hydrant by voice. Protocol tracks the rest.
Your last session shows up before every set, warm-ups and plates are worked out for you, and your coach sees every lift next to your sleep and recovery.