Howcast - Worried you can't improve yourself and maintain your rep? Here's how you can get a rock-hard body without looking soft.

Howcast - Learn how to sing the classic kid's song 5 Little Ducks with this Howcast video.

Howcast - Learn how to sing the classic kid's song 5 Little Fishies in the Sea with this Howcast video.

Howcast - With more water-training devices than ever, learn how to wade through the myriad of choices in water exercise equipment and make the right choice.

Howcast - Learn about Vadim Shoykhet & Gregory Feldman, two of Howcast's swimming experts, in this video.

Howcast - Learn how to swim laps in this online swimming lesson from Howcast.

Howcast - Learn how to do the swimming technique called sculling in this online swimming lesson from Howcast.

Howcast - Learn how to do the back crawl / backstroke in this swimming lesson from Howcast.

Howcast - Learn how to animate fish swimming from Joe Vena of the Children's Museum of the Arts in this stop motion tutorial from Howcast.

Howcast - Pregnancy is an exciting time; unfortunately it comes with discomforts. Follow these simple steps to learn how to alleviate back pain.

Howcast - Hair extensions are expensive, so make sure you keep yours looking great as long as possible.

Howcast - So you wanna be a centenarian! Exercising and eating right are obviously essential, but there are other, surprising things that may help you reach that momentous milestone. Here's to old age!

Tackle three sports at once and get fit by training for a triathlon.

Him and his mom are practically joined at the hip.

Ever heard the saying "busy as a beaver?" Just watch Justine in action.

Learn how beavers are such great swimmers, and more.

The gopher tortoise, which is built for being on land, is considered a "keystone species."

Ever heard the saying "busy as a beaver?" Just watch Justine in action.

The platypus is even weirder than it looks.

Some lesser-known facts about these fascinating creatures.

Learn how beavers are such great swimmers, and more.

Ever heard the saying "busy as a beaver?" Just watch Justine in action.

Ever heard the saying "busy as a beaver?" Just watch Justine in action... swimming, eating, and moving branches.

Follow along with wildlife ecologist Josh Griffiths as he breaks down some weird facts about one of the most evolutionary distinct mammals on the planet.