Fire Hydrants are yet another phenomenal exercise dedicated to glute activation. Keep in mind that a thorough stretch following this exercise is recommended as with any strengthening exercise.
Preparation: Begin on “all 4’s”. Make sure your arms are locked out, your back is flat and your head is facing the ground.
Execution: Keeping your back flat and your knee bent at 90 degrees slowly lift your left leg up and out to the side until it is level with your back. Repeat 5-10x on each side.

Need another visual? Imagine a dog stopping to pee on a fire hydrant, hence the name.
[...] 2) Fire Hydrants- Learn how [...]
[...] trainer or on your own, make sure you are doing lateral movements (side lunges, jumping jacks, fire hydrants and side shuffles) to work those neglected abductor/ adductor muscles (inner and outer leg) Try [...]
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[...] the IT band. Great exercises to increase gluteus medius strength include clamshells, leg raises, fire hydrants, or side jumps onto a [...]