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With the death of a London Marathon runner now linked to a popular sports supplement, we had to ask

I’ve read that road cycling is bad for your bones, but how does mountain biking stack up?

Avalo York once ruled the Central Park bike loop. He's still there, almost every weekday, but he's been done with racing for a long time.

A new study shows that warm-ups are best served short, but can we trust the results?

A conversation with Dr. Stacy Sims, endurance runner, Ironman triathlete, and pro-elite road racer who has been studying the science of performance and nutrition for two decades

A new study shows that a polarized training approach leads to the biggest fitness gains, but can we trust the results?

Every option, from Strava to MapMyFitness, offers a different set of features. Use this handy guide to determine which one will most help you achieve your fitness goals.

Last year, Patrick Halloran finished last in the Empire State Building Run-Up. This year, he's coming back, and he's going to kick your ass.

Andy Potts' key to a fast run? Stay tall. Greg McMillan, of McMillan Running in Flagstaff, Arizona, explains how to avoid hunching over, for a more efficient stride.

For Potts, the fastest American finisher at the 2012 Ironman World Championship, breakthrough performances mean paying attention to the little things. Even your socks.

Signing up to run a race in a warm, tropical climate seems like a fun way to travel and beat the winter blues—but I’d have to train here, where I live, in the cold. Should I worry about the temperature difference, and how can I make the adjustment easier?

Noah Davis swam and biked and ran—all without ever leaving home

Even endurance athletes can score performance gains with high-intensity interval training. Here's how to do it.

I live in Florida. How can I train for a snowshoe race?

Can high levels of endurance training lead to irreversible heart damage? A new report is giving athletes panic attacks.

Everything you need to improve your time on the course

Heidi Volpe speaks with Rich Roll about his transformation from addict to ultra-endurance athlete

¹ú²ú³Ô¹ÏºÚÁÏ readers send us their favorite gear

¹ú²ú³Ô¹ÏºÚÁÏ readers send us their favorite gear

Looking for which candidate's economic beliefs are best suited to the present day? Wondering who's better suited to take office should the next president become incapacitated? Well, you've come to the wrong place.

Is "running everywhere" a feasible replacement for biking, cabs, and the subway? Noah Davis spent a week trying to find out.

Noah Davis takes a look at Wade Barrett's transition from professional soccer player to semi-serious ultramarathoner

What does the popularity of a zombie-themed obstacle race say about American society?

Fitness magnate Bahram Akradi is buying up some of the most beloved endurance events in the country—and he has plans to improve them. So what's everybody afraid of?

Lance Armstrong has always denied Mike Anderson’s claim that he broke his word on a business deal, and that Anderson saw and heard evidence indicating that Armstrong was using performance-enhancing drugs. His lawyer, Mark Fabiani, sent this response to Anderson's allegations.

Meaghen Brown is in France, reporting from one of the world's most grueling footraces

Common medications that will—and won't—earn you a suspension

The U.S. men's soccer team made history against Mexico last night. But what makes one win so impressive?

Tough Mudder says their Electroshock Therapy obstacle delivers a 10,000-volt electric shock. Can a human survive that, or is it a sham?

How Brother Colm O'Connell became the guru of Kenyan running

I know that exercise is supposed to improve sex, but is there a point of diminishing returns?

I'm looking to maximize my triathlon training days. Could you recommend a few places?

The big picture

The dynamic master plan

Muscle bound

Weeks 13 through 16

Heart-rate training is the key to gauging your aerobic intensity and building endurance. Here's how to get started.

Get a solid endurance base through heart-rate training.

To keep a workout program fresh, you need to make it your own, and some days you need to break the rules—within reason.

The first four weeks

Unlocking real staying power

Everything you need to run a personal best, including a 12-week training plan, a race-day nutrition plan, and advice from U.S. record holder Ryan Hall

Training with a monitor can be daunting to master, but it’s the best way to make the most of your workouts.

A combined heart-rate monitor and GPS watch will supercharge your training. Motorola's Motoactv is one of the best on the market.

Triathlons aren’t just trendy. Multisport training develops balanced fitness and prevents injuries. Here’s why you should dump your ordinary routine and make the switch, too.

We break down the best sites, Facebook and Twitter accounts, and apps for travelers, bikers, gear nerds, and more

Does stretching prior to a run prevent injuries and improve performance? Does guzzling water prevent cramps? Here's the truth about the top 10 fitness myths.

Welcome to the frozen, on fire, wet, barb-wired world of Tough Mudder—where adventure racing starts to look a lot more like hazing

A collection of the web's best running blogs, from journalists, fans, and runners

The masochistic sport of obstacle racing has exploded in popularity. Nick Heil tries to understand why so many are signing up for the misery.

Cross-country skiing is among the world's great human-powered modes of movement. Whether you ski classic or skate, here’s the gear you’ll need to get started.

An easy, dramatic performance boost based on an old science is catching on. It's about time.

¹ú²ú³Ô¹ÏºÚÁÏ reviews the best gear in the 2012 Winter Buyer's Guide, including the Casio ProTrek PRW-5000Y-1 watch.

With temperatures below zero, more than 4,500 feet of climbing, and 9,400 competitors, Wisconsin’s American Birkebeiner is the largest and one of the toughest cross-country ski races in the United States. Crossing the finish line is nothing short of a lifetime achievement. Here's our plan to get you there, even if the closest you've come to snow is the frost in

Want to make this year memorable? Start training now and destroy your office mates in a 10K.

How does ultrarunner Ray Zahab—who became famous for expeditions traversing the harshest terrain on earth—up the ante? By taking high school kids on his next series of trips.

I haven’t run a 10K since high school, but I’d like to get back into running. Can you set me up with a three-month training plan?

Surf reports, bouldering routes, bike shops, and more—all at your fingertips

When 34-year-old Hobie Call lost the Death Race this past August, he also lost his chance to win $100,000 for sweeping the Spartan Races. So why does he keep competing?

Avoid the pitfalls.

Get faster by getting leaner.

Seven fitness apps

July 2011

An overweight ex-drunk decides to crash-train for a 16-mile race up and down a mountain. Hey, what could go wrong?

By the end of the day, I often feel too tired to exercise. Is it better to skip my workout or trim it down? The Editors Santa Fe, NM

Serving as his own lab rat, an amateur bike racer spent a year taking supplemental testosterone—rumored to be a peloton favorite—to find out if it could transform an average Joe. His conclusion? No doubt about it.

They don't have sponsors, and they're not getting paid to train. But these day-job-holding athletes compete like elites. Follow their lead and you can, too.

An exclusive look inside the cutting-edge Army lab that's pinching, prodding, dunking, bruising, and building the soldiers of tomorrow—and revolutionizing adventure fitness along the way.

Getting fit doesn't have to mean more time training. Just more sweat.

The three secrets of hyper-efficient fitness

Think you don't have time for a fitness routine? If you can block out a couple of hours during the week and some longer periods on weekends, the results will amaze you.

I've run three marathons in roughly four hours. What can I do to help lower my finish time? The Editors Santa Fe, NM

I'm planning to walk from Sandy, Oregon to Seattle, Washington. How should I train? The Editors Santa Fe, NM

Barefoot-inspired shoes are flying off the shelves, and they're poised to transform the way we run. Here's how to make the most of running with less.

In 2007, molecular biologist Ron Evans flipped a genetic switch on test mice and turned them into super-athletes. Headlines ensued, as did nervous references to human applications and "exercise in a pill." Evans is still toiling away in the lab, and guess what? The day is coming.

Triathlon is one of the most gear-intensive sports there is, so try a few tris before you invest in a top-of-the line wetsuit or bike. In the meantime, here are a few great buys that will shave seconds off your time and get you amped for an Ironman. Specialized Women's…

I tore my MCL playing football. Unfortunately, the only working out I can do is upper body strength training. Please help me out with some sort of aerobic workout not using my lower body. My whole life is outdoors and I want to get back to it as quick as possible. The Editors Santa Fe, NM

Will caveman calisthenics be the next big thing for adventure athletes?

Are your workouts working against you? Why one addictive kind of training might be sabotaging your game.

It's huge. It's nasty. And it's a beast to get up. But guess what: The summit is worth all the hard work it takes to get there.