Hip Bridge: Lie on your back with your knees bent and your arms are at either side. Now, raise the lower back from the floor and lift it up while the upper body and arms remain in contact with the floor.
Do this exercise for 6 to 8 repetitions. This exercise strengthens the hip flexors, lower abdomen and lower back. To make this exercise more challenging, you can lift one of your feet off the floor while raising your lower abdomen off the ground.