Movement: Start this exercise on all fours on your hands and knees. Keeping your lower back stable and without hyperextending, activate the glute of your right leg and lift it out to the side. Hold at the top, return to the start, and switch legs.
Repetitions: Perform all prescribed reps on one side, then on the other. This counts as one set.
Instructions and effects for the Fire Hydrants exercise 
Movement in Sagittal Plane