Core-strengthening exercises have become increasingly popular among top athletes, fitness enthusiasts and those who seek overall body strength. According to the Mayo Clinic, strengthening the back, pelvis, hips and abdomen can improve balance and stability. These exercises, which can be done with no special equipment, include crunches and push-ups.

Building core strength can help prevent lower-back pain and muscle injuries and enhance performance in tasks and activities ranging from tying your shoes to golfing. To start, try performing 10 to 15 repetitions of each exercise two or three times a week. Then gradually increase the intensity, which can lead to further improvements.

The Glute Bridge: Lie on your back with arms at your sides and knees bent. Lift your hips until your knees, hips and shoulders are in a straight line. Hold for two or three seconds.

Lateral Pillar Bridge: Lie on your side, propped up on one elbow. Lift your hip to make a straight line from ankle to shoulder. Hold for 15 to 30 seconds, and then repeat on the other side.

Plank With Arm Lift: Start in a push-position. Without moving your torso, lift your left arm up and slightly to the left. Hold for a few seconds, then switch to the other arm.