Strong abdominal and back muscles are essential for peak performance. Consider including these exercises two or three times a week to improve posture, form, and speed in addition to walking 30 minutes a day, five days a week.

• Front plank. Starting on your stomach on a mat or the floor, this exercise targets both your abs and back.

• Modified side plank. Lying on your side this time, this exercise targets your abs, glutes, and hips.

• Bird dog. Working from a starting position with your knees bent, on all fours, this exercise targets your back, abs, and hips.

Exercises that build and maintain core strength are an important part of your fitness program.