Want to learn how to add size to your body? Follow these 6 rules on building muscle mass and you'll be growing in no time.

One of the most endearing male celebrities, Ryan Gosling opened up about regretting quitting ballet. See what he had to say.

It's week two of LIVESTRONG.COM'S 10,000 Steps a Day Challenge! Here are some creative tips to keep you going.

While old-fashioned crunches are what I consider a good "finisher" at the end of your core training, poor form often results in not much else than a sore neck.

Aerobic fitness is a measure of your body's ability to take oxygen from the atmosphere and use it to produce energy for your muscle cells.

Circuit training improves the musculoskeletal system and interval training improves cardiovascular endurance.

Jumping rope can't be beat for versatility and quickly getting the heart rate up in a high-intensity interval training session.

You can become a certified personal trainer in as little as two months depending on how much time you have to devote to studying.

The International Sports Sciences Association offers a distance-learning personal trainer certification covering such topics as program development, anatomy and nutrtion.

Any sport in which your muscles contract repeatedly against resistance for an extended period of time requires muscular endurance.

A person weighing 155 pounds will burn about 300 calories in an hour of water aerobics. If you work harder, you'll burn more.

Punching with small hand weights can help boxers increase hand speed and power or provide non-boxers with a fun way to stay fit and tone the upper body.