A toned physique will help you appear years younger; from afar. But unless you’re exercising the muscles in your face, factors like gravity and stress will give away your age by pulling down the corners of your mouth and exaggerating your jowls.

A traditional crunch or sit-up can cause compression to the discs in your spine, causing them to bulge and press on nerves.

Everyone expels gas, but it can build up during exercise and release when you squeeze and compress your stomach during abs workouts.

Push-up bars increase range of motion in push-ups which leads to greater increases in strength and muscle growth.

The stomach vacuum, when practiced regularly, trains your transverse abdominis. This deep abdominal muscle contributes to ab strength.

The Couch to 5K program -- designed by Cool Running to ease beginners into a running program -- can be completed indoors or outdoors. For some, running outside isn’t possible for reasons related to safety or weather.

Most back exercises are compound exercises. They work several muscle groups at one time and burn more calories than isolation exercises.

Muscle endurance training is the middle ground between strength and endurance training to improve the stamina of your muscles.

A good women's kickboxing shoe should have adequate support, fit snugly, be flexible and be lightweight.

Cardio exercise does more than just strengthen your heart—it helps you maintain your weight, improves your lung function, helps you sleep better and more.

Before you pay anything to an organization to become certified as a personal trainer, learn more about the job, its salary and its outlook for employment growth.

How much weight you can lose with aerobics really depends on your dedication to the activity, your size and your dietary habits.