Why 'Time on Feet' Is Such a Powerful Measure of Endurance

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Don’t sweat pace or distance—just go run. —Chris Cohen, deputy site editor

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Why 'Time on Feet' Is Such a Powerful Measure of Endurance

Most runners take pride in detailed metrics—miles logged, pace per mile, personal bests. But there’s one simpler number that might deserve more of your attention: “Time on feet” (TOF), which is all about tracking how long you’re out there rather than fixating on distance or pace. Instead of aiming for a four-mile run at 8:30 pace, you could substitute a 45-minute session without worrying about how far or fast you went. While this approach is most popular in ultrarunning, where athletes spend hours and hours on the trail, it’s also beneficial for everyone from first-time 5k participants to seasoned marathoners—and, really, anyone who wants a higher VO2 max. (Which is everyone, right?)

Keep It Simple

For competitive runners, the pure amount of time you spend running is a strong indicator of success. A 2023 study showed that training volume—not the average or longest distance you run—is the most significant factor for predicting a marathoner’s race times.

When you add volume at a low intensity, you’re building your aerobic base, which Ron Hammett, coach at Sundog Running, likens to an engine. “If it's a small engine, you can only go so fast and so long,” he says. “The more volume you can do, the more it expands that aerobic engine—your capacity to get faster, to go longer, to be more efficient.”

But TOF isn’t just about physical benefits—it’s good for your mental game. Shifting your focus to time rather than distance can help you slow down and embrace the benefits of easy running. Relaxed zone 2 time, which some experts say should make up about 80 percent of your training, is crucial for building endurance: When your goal is to log time rather than distance, you’re less inclined to rush through your workout just to hit a certain mileage. For example, if you’ve got a recovery run scheduled as a five-mile easy run, you might be tempted to speed through it to get on with your day. But if you’ve planned a 60-minute easy run, you’re more likely to take it at the right pace.

Evan Hoyt, an exercise physiologist at Human Powered Health, adds that TOF gives you the freedom to listen to your body: “If you don't have any specific goals involved, it takes all the stress out of achieving a tangible goal at the end of it. It just makes it a little bit more enjoyable,” says Hoyt. “It’s also a really good tool to not overtrain.” You can also more easily swap in low-impact forms of cardio when you’re feeling a bit banged up—if your hips or feet are screaming at you, you could even hop on a bike for 45 minutes instead.

How to Train With Time on Feet

For beginners, Hoyt says the most important thing is to build up TOF slowly. “If someone wants to run their first 5k but doesn’t have a specific time goal, then I would write a plan around the estimated time that we’ll run it in,” he says. For example, if you run a 10 to 15 minute mile, the run would take 30 to 45 minutes. “You just want to train the body to be able to move for that long,” he says.

Of course, you don’t want to start out with a 45-minute run if you’re just getting off the couch. Hoyt suggests gradually increasing your TOF, starting with 10 minutes at a time and incorporating run/walk intervals to build up your endurance. As you progress, you can extend those runs to 15, 20, 30 minutes and beyond.

For intermediate to advanced runners, such as those training for a half-marathon or marathon, Hoyt structures a training program into three blocks. The first block focuses on building a base using TOF, especially for long runs. During the second block, the runs get longer—think bumping an hour-long run up to an hour and a half or two. You won’t be able to rely entirely on time—he also adds in distance or speed workouts once or twice a week. In the final block before tapering, the focus shifts more toward distance, with TOF primarily used for recovery runs.

The best thing about TOF training is how simple it is—you can just go out and run based on how you feel. Regardless of what type of runner you are—whether you're chasing a PR or simply looking to pick up a new hobby—training by time on feet might just be the secret ingredient that keeps you moving forward. —Hannah Singleton

Related:

- Why easy “zone 2” workouts became the biggest thing in fitness
- How to run your way into better shape

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Plus: Barry Keoghan and Jacob Elordi are still bro’ing down and twinning out. | GQ's Manual Don’t sweat pace or distance—just go run. —Chris Cohen, deputy site editor Trending * Barry Keoghan and Jacob Elordi are still bro’ing down and twinning out * One of the best affordable watches just got even better * The business of being Beyoncé Knowles-Carter * Would you pay $1,500 for a pair of New Balance sneakers? Image may contain: Clothing, Shorts, Person, Footwear, Shoe, Adult, Art, and Painting Why 'Time on Feet' Is Such a Powerful Measure of Endurance Most runners take pride in detailed metrics—miles logged, pace per mile, personal bests. But there’s one simpler number that might deserve more of your attention: “Time on feet” (TOF), which is all about tracking how long you’re out there rather than fixating on distance or pace. Instead of aiming for a four-mile run at 8:30 pace, you could substitute a 45-minute session without worrying about how far or fast you went. While this approach is most popular in ultrarunning, where athletes spend hours and hours on the trail, it’s also beneficial for everyone from first-time 5k participants to seasoned marathoners—and, really, anyone who wants a higher VO2 max. (Which is everyone, right?) KEEP IT SIMPLE For competitive runners, the pure amount of time you spend running is a strong indicator of success. A 2023 study showed that training volume—not the average or longest distance you run—is the most significant factor for predicting a marathoner’s race times. When you add volume at a low intensity, you’re building your aerobic base, which Ron Hammett, coach at Sundog Running, likens to an engine. “If it's a small engine, you can only go so fast and so long,” he says. “The more volume you can do, the more it expands that aerobic engine—your capacity to get faster, to go longer, to be more efficient.” But TOF isn’t just about physical benefits—it’s good for your mental game. Shifting your focus to time rather than distance can help you slow down and embrace the benefits of easy running. Relaxed zone 2 time, which some experts say should make up about 80 percent of your training, is crucial for building endurance: When your goal is to log time rather than distance, you’re less inclined to rush through your workout just to hit a certain mileage. For example, if you’ve got a recovery run scheduled as a five-mile easy run, you might be tempted to speed through it to get on with your day. But if you’ve planned a 60-minute easy run, you’re more likely to take it at the right pace. Evan Hoyt, an exercise physiologist at Human Powered Health, adds that TOF gives you the freedom to listen to your body: “If you don't have any specific goals involved, it takes all the stress out of achieving a tangible goal at the end of it. It just makes it a little bit more enjoyable,” says Hoyt. “It’s also a really good tool to not overtrain.” You can also more easily swap in low-impact forms of cardio when you’re feeling a bit banged up—if your hips or feet are screaming at you, you could even hop on a bike for 45 minutes instead. HOW TO TRAIN WITH TIME ON FEET For beginners, Hoyt says the most important thing is to build up TOF slowly. “If someone wants to run their first 5k but doesn’t have a specific time goal, then I would write a plan around the estimated time that we’ll run it in,” he says. For example, if you run a 10 to 15 minute mile, the run would take 30 to 45 minutes. “You just want to train the body to be able to move for that long,” he says. Of course, you don’t want to start out with a 45-minute run if you’re just getting off the couch. Hoyt suggests gradually increasing your TOF, starting with 10 minutes at a time and incorporating run/walk intervals to build up your endurance. As you progress, you can extend those runs to 15, 20, 30 minutes and beyond. For intermediate to advanced runners, such as those training for a half-marathon or marathon, Hoyt structures a training program into three blocks. The first block focuses on building a base using TOF, especially for long runs. During the second block, the runs get longer—think bumping an hour-long run up to an hour and a half or two. You won’t be able to rely entirely on time—he also adds in distance or speed workouts once or twice a week. In the final block before tapering, the focus shifts more toward distance, with TOF primarily used for recovery runs. The best thing about TOF training is how simple it is—you can just go out and run based on how you feel. Regardless of what type of runner you are—whether you're chasing a PR or simply looking to pick up a new hobby—training by time on feet might just be the secret ingredient that keeps you moving forward. —Hannah Singleton Related: * * Why easy “zone 2” workouts became the biggest thing in fitness * How to run your way into better shape Style * Drew Starkey is becoming one of our finest suit wearers * The Air Jordan 5 ‘El Grito’ is a supremely clean tribute to Mexican Independence Day Wellness * The Real-Life Diet of Titans QB Will Levis, who eats two dinners during football season * Should you buy into the colostrum craze? 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And check out our other free newsletters: Cam Wolf on watches, Samuel Hine on the fashion world, Chris Black on culture, GQ’s daily must-read story, and more. InstagramTikTokFacebook XYouTube This e-mail was sent to you by GQ Daily. To ensure delivery to your inbox (not bulk or junk folders), please add our e-mail address, [email protected], to your address book. View our or manage your newsletter subscriptions here Copyright © Condé Nast 2024. One World Trade Center, New York, NY 10007. All rights reserved.

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