CrossFit champ Samantha Briggs believes in resting as hard as you train and ditching the set exercise schedule. She shares her favorite training tips.

Obstacle races are slowly supplanting 5ks as the Weekend Warrior’s activity of choice. But with so many choices how does one know which grueling crawl under barbed wire is the right one for them?

The pros share their secrets for tackling the sport’s most popular obstacles

The eight-week training plan for obstacle-course domination. PLUS: The Dos and Don'ts of race day gear

The obstacle racing phenom on how he stays fit to compete

Surefire energy comes with Hobie Call's delicious wheatgrass smoothie

End summer right. Celebrate Labor Day with our make-your-own backyard pentathlon.

Mike Donoghue, the founder of Amphibious Medics, a private medical-staffing contractor for the nation’s largest events, including Tough Mudder and Spartan Race, offers his insider tips

Chris Sharma may be 32, but he’s still pushing the sport’s limits as a pioneer of deep-water soloing.

The Olympic decathlete on how to eat, train, and perform better

Five great exercises you can do in just 20 minutes

I spend a lot of time training and competing in various sports—cycling, running, and basketball—you name it. My wife and I would like to have a baby soon, so I would like to know if there are there any sports that could hurt my sperm count.

Jennifer Kessy and April Ross prepare for domination

Not a week goes by without a study pegging weight gain to genetics. But the connection between heredity and making your racing weight may be more tenuous than it appears at first glance.

Tips to hack your body

Two-time CrossFit champ Rich Froning doesn't subscribe to fussy diets or exercise schedules, but he's seen real results. He shares his best practices.

A professional freediver is training athletes to get more oxygen with every breath

A new breed of sports drinks, backed by a decade of studies, are challenging common assumptions about how best to hydrate—and offering smarter, more effective alternatives

I work at the computer, at home. I considered modifying my desk to accommodate a treadmill, but after a reality check, I have no room or money for one. Are pedalers any good? If not, what is another option?

I can't live without coffee, but when should I cut myself off?

The trendy fruitarian diet is gaining a reputation for possible health risks. But the right fruits, assuming they’re not your only energy source, pack a performance punch.

The trendy fruitarian diet is gaining a reputation for possible health risks. But the right fruits, assuming they’re not your only energy source, pack a performance punch.

The trendy fruitarian diet is gaining a reputation for possible health risks. But the right fruits, assuming they’re not your only energy source, pack a performance punch.

The trendy fruitarian diet is gaining a reputation for possible health risks. But the right fruits, assuming they’re not your only energy source, pack a performance punch.

The trendy fruitarian diet is gaining a reputation for possible health risks. But the right fruits, assuming they’re not your only energy source, pack a performance punch.

The trendy fruitarian diet is gaining a reputation for possible health risks. But the right fruits, assuming they’re not your only energy source, pack a performance punch.

I like to compete in endurance events, like Ironman, but rarely do I place in the top 50 percent of my age group. Why am I so slow?

How you can reboot your circuit training routine by ditching the rest interval.

Pro surfing’s go-to trainer Paul Hiniker lays down 10 steps to get your body ready for anything this summer

This move works your chest, shoulders, triceps, core, and hip flexors.

This move works your core, shoulders, lats, back, and legs.

This move works your shoulders, core, obliques, quads, outer thighs, hip rotators, and your balance.

This move works your inner and outer thighs, hip stabilizers, core, shoulders, back, and posterior chain.

This move works your back, shoulders, core, and inner thighs.

This move works your core, glutes, hamstrings, back, rear shoulders, and proprioception.

This move works your shoulders, chest, back, core, inner and outer thighs, and hip rotators.

New technology has made it easier than ever to keep real-time tabs on an endless array of fitness metrics. Don't drown in the data stream.

Marco Sanchez demonstrates.

Marco Sanchez demonstrates.

Marco Sanchez demonstrates.

Marco Sanchez demonstrates.

I run a lot and feel like I’ve had back pain forever. I read about a new study that found bacterial infections cause 40 percent of chronic back pain. Does that study apply to athletes with back pain? Should I ask my doctor about getting tested for a bacterial infection?

Keep the beet alive a little longer with this guide to preservation

The ultimate guide to finding your ideal race

Pro-Bar founder Art Eggertsen's recipe for a protein-rich calorie grenade

Increase your hip flexibility and take your upper body and core strength to the next level

Keep your legs moving with this pre-race plan

Keep your legs moving with this pre-race meal plan

Keep your legs moving with this pre-race meal plan

Keep your legs moving with this pre-race meal plan

Keep your legs moving with this pre-race meal plan

Keep your legs moving with this pre-race meal plan

Keep your legs moving with this pre-race meal plan

Whenever I have a tough task to complete at work, I feel like my after-work workout suffers. Can thinking hard hurt my physical performance? Does my brain use up more energy the harder I have to think?

Comes in eight flavors, made with a proprietary grinding process that guarantees optimum flavor and consistency.

I’ve read that tomato paste, green tea, and even chocolate can keep me from getting sunburned. Is that true? And what SPF are we talking here?

No one wants to be stuck in a yoga studio when the weather is nice. The solution? Take your practice to the trails.

This year’s bumper crop of paleo-inspired health, diet, and exercise books is proving that the prehistoric movement is here to stay

Now that I’m 40, I feel like I don’t recover as quickly from workouts as I did when I was younger. Is there a scientific explanation for this? Or is it all in my head?

First, ditch the salt tablets. “The biggest misconception is that exercise-associated muscle cramping is due to dehydration or electrolyte imbalances,” says Martin Schwellnus, a professor of exercise science at the University of Cape Town, in South Africa, and one of the world’s leading researchers on the subject.

Using Twitter and a lot of hugs, a renegade tribe from Boston attempts to reimagine fitness as a social event

Is it possible to be strong without having big muscles, or to be huge but not very strong?

Move over EPO: Dynavision’s CoreControl cooling glove enhances performance with just a vacuum and ice

The extreme polar explorer on rock lifting, noodles, and scheduling conflicts

Would taking a shot from an EpiPen during my race give me an advantage?

A four-step guide to coloring outside the lines

I read that NFL players over hydrate before their games. Should I be doing the same thing before my marathon?

What you need to know to get running

Should I take ibuprofen before or after hard training to limit pain?

I'm a 31-year-old professional who sits on his butt a lot. I used to find getting into shape easy, but now es no bueno. I'm not overweight, I just can't get into an exercise routine which actually helps me get fit and buff. Can you give me advice on how to get fit enough to be rocking in the sack again?

Training hard but still eating like you’re not? You could wind up with hormone deficiencies. The consequences can be dire: low energy, diminished sperm count, and an inability to conceive children.

How the San Jose Earthquakes forward handles a grueling eight-month soccer season

Where did the myth that a woman’s uterus would fall out if she participated in sports come from?

I’m training for a triathlon, and I need to take in a lot of calories when I’m on the bike or trail. That often means eating energy bars, which get old fast. What's the best bar for alleviating taste fatigue?

There's nothing like a bit of wine in the backcountry. But packing a bottle poses many problems. Get around all of them by embracing the Bladder in Box technology.

With 13.7 million Americans participating every year, hunting is making a big comeback. Here are some great recipes for your latest take.