In which I revisit some of my favorite posts from 2009. Watch a Malaysian mine collapse, read about a truly homemade toaster oven, and find out if kites can pow

American runners are getting slower, and it's not because more women are running now then ever before.

Study finds you may be better off moving your workout indoors.

A new study buries the concept of "fat but fit," and finds that obesity is more dangerous than a lack of fitness.

Two new studies find that hot yoga may help to reduce stress, anxiety and emotional eating.

Running and walking may have similar benefits, but are there times when is walking better than running?

If you want to try a triathlon, here's what you need to know about the event that combines swimming, cycling and running. Experts Erin Beresini weighs in.

Why aren't women counted in most exercise studies? Their periods tend to mess up the data.

A new study reveals that a lean, fit body equals happy teeth and gums.

Kids make the best workout buddies. Here's how adults can tailor their exercise routines to a child's abilities.

Rhabdomyolysis is rare, but if your workouts cause extreme soreness or swelling, check with your doctor.

Dogs and cats can't help themselves when you unroll the yoga mat. They either participate or just get in the way.

Adding walking poles to your daily jaunt is an excellent way to boost your calorie burn, and they may even help prevent chronic pain with aging.

NBA star LeBron James may have just launched a new fitness revolution with his use of "yoga bubbles."

Schools are phasing out dodgeball and other sports in favor of exercises that get kids moving for a lifetime.

A study in the Lancet looked at over-60 walkers, and those who worked on a busy London street didn't fare as well as the park walkers.

Yoga nidra, also called sleep yoga, is a restorative style of yoga that looks (and feels) more like taking a nap than exercise.

New research out of Australia unlocks clues about how your body responds to exercise at the cellular level.

Study finds bananas do more than help you recover after exercise. They also help reduce pain and swelling.

Competitors from around the world line up on an Arctic ice floe to tackle one of the world's most difficult 26.2-mile races.

In the Netherlands, men over 65 on e-bikes are causing a big spike in the cycling death rate. And the Dutch are ahead of the game on all things biking.

Here's the secret to getting that smell out of your high-tech exercise wear.

Balance is tied to both strength and overall physical health, here are some exercises for any fitness level.

Your body clock influences what time of day you burn more calories.

Go ahead and have a seat. New research says it's not the sitting that's the problem.

Weight lifting does more than just pump you up; it can increase your chances for survival.

From your heart to your head, here's why you should lace up your sneakers and walk.

Defying stereotypes, teenager Vilde Westeng aims to be the best halling dancer.

Thomas Panek just became the first blind runner to complete the NYC Half Marathon with guide dogs.

The benefits of cumulative exercise are well-documented. Here's how to get your exercise, 10 minutes at a time.

Are you new to stretching? Here are some tips on how to improve flexibility and information about the kinds of stretching you should be doing.

Your social network predicts your health and wellness more than your fitness tracker, study finds.

Researchers looked at walkers and runners with bent and straight arms to find out.

These half-dozen exercises will help you shed pounds if obesity is in your genes.

There are many styles of yoga to choose from, so if you’re new to yoga, it might be confusing to know the best place to start.

The fitter you are, the stronger your brain will be as you age, which can help increase joy and improve cognitive function.

Valley fever, or coccidioidomycosis, is a potentially deadly fungal infection that has been called California's "silent epidemic."

Climatologist documents Greenland's warming conditions with a photo of sled dogs splashing in meltwater on top of sea ice.

The Amazon rainforest fires have been burning for 3 weeks, and some are wondering why Brazil's crisis isn't getting more attention.

This is what the skies over Beaumont, Texas, look like whenever one of the local refineries loses power.

Before clean air laws were passed in Pittsburgh, smoke left buildings in a nighttime shroud all day, yet air quality issues aren't really in the past.

The Canary is a smoke and carbon monoxide detector-cum-air quality analyzer sporting good looks and remarkable smarts.

Outdoor air pollution has now been classified as 'carcinogenic to humans' by the United Nations.

Visibility in Harbin, China has dropped to 33 feet in the wake of monster smog rolling through the area.

Tokyo, which cleaned up its act in the 1970s, is a role model as the Chinese capital starts to address some of the world's worst air pollution.

Four cinder blocks + one minute of time = wonderfully functional rocket stove.

Many American likely aren't aware that the air in their homes and offices may be cause for concern.

What good is it if all of the historical cities and natural beauty in China are covered by haze?

Loopholes in the Montreal Protocol may need to be tightened, researchers say.

Electronics giant announces it will compensate workers relocating to China for the poor quality of air they will have to breathe.