Incorporate this exercise into your workout regimen to strengthen your glutes.  Because of our sedentary lifestyles, are glutes can be very weak.  This puts extra pressure on other muscles including the low back and hip flexors.

While performing you can hold onto a chair and wear shoes.  Proper form is important.  Draw your navel in and lift the leg while squeezing your glutes.  You should not feel tension in your low back.