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Fire Hydrants

On all fours, lifting one knee out to the side. It looks silly and it works the side of the backside that almost nothing else reaches.

Level Beginner
Equipment None
Sets and reps 3 sets x 15 each side
Works on Side glutes, hips

How to do it

  1. Get on all fours with hands under shoulders and knees under hips.
  2. Keeping the knee bent at ninety degrees, lift the right leg out to the side.
  3. Go up until you feel the side of the hip working, not higher.
  4. Lower slowly without letting the knee touch down. Finish the set, then swap.

Common mistakes

  • × Leaning the whole body to the other side to lift higher.
  • × Straightening the lifting leg - the knee stays bent.
  • × Arching the lower back - the spine stays flat.
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One thing that matters

Height does not matter here. A small lift with the hip square beats a big one with a twisted body.

How much

Sets and reps for Fire Hydrants

Where you are Aim for
Just starting 3 sets x 10 each side
The standard 3 sets x 15 each side
Once it is easy 3 sets x 25 each side, 2 second hold
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Breathing

Out as the knee lifts out, in as it comes back. Slow enough to keep the rhythm.

Too hard, or too easy?

Where this sits

Questions

Fire Hydrants, answered

What do fire hydrants work?

The gluteus medius - the muscle at the side of the hip that stops your knee caving inwards when you squat, run or climb stairs. It is small, easily neglected and involved in a lot of knee complaints.

How high should the knee go?

Only as high as you can keep your hips square to the floor. Most people can go less far than they think. Rotating the torso to lift higher trains nothing.

Why do they feel so easy?

Because the load is tiny - it is one leg against gravity. Slow the movement down and hold two seconds at the top, and it stops feeling easy quickly.

One exercise is never the whole story

Which day to do Fire Hydrants, how many sets, and what to pair it with - the AI builds the whole plan. Your first one is free.

Build My Free Plan
Glutes

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This is general information, not medical advice

Everything on this page is worked out from a formula or from published averages. It has never met you, and it cannot see your blood pressure, your medication or an old injury.

Talk to a doctor before you start if you are pregnant or breastfeeding, have a heart condition, diabetes or high blood pressure, take regular medication, have or have had an eating disorder, are recovering from injury or surgery, or are under 18. Stop and get advice if any exercise causes pain, dizziness or chest discomfort.

More about where these numbers come from is on the about page.