Uploaded April 2026 | Updated September 2026, 1 day ago
Carbohydrates. Everyone is talking about them, but there's lots of conflicting information out there about how many you actually need to fuel your running. To help, we sent Tom and Mark (two very different runners!) to the Science in Sport lab to test how many carbs they actually burn when running and what that means for their marathon performance.
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What’s in this video?
00:00 Intro: Testing Marathon Fueling Needs
00:37 Phase 1: Lactate Threshold Test
02:21 Phase 2: VO2 Max Test
04:31 Phase 3: Carb Oxidation Test Explained
07:37 Results: Carb Use for Different Runners
08:59 Science Behind Carb Burn Rates
09:35 Mark's and Tom's Fueling Results
11:50 Differences for Female Athletes
12:14 Summary: Takeaways for Every Runner
MUSIC licensed by Artlist and Epidemic Sound
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Wearables Partner: Garmin - garmin.com
Training Partner: Runna - Want to give Runna a try? Click below for a 2-week FREE trial: web.runna.com/redeem?code=TRC26
Nutrition Partner: Science in Sport (SiS) - scienceinsport.com
Treadmill Partner: Wahoo - uk.wahoofitness.com
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Carbohydrates. Everyone is talking about them, but there's lots of conflicting information out there about how many you actually need to fuel your running. To help, we sent Tom and Mark (two very different runners!) to the Science in Sport lab to test how many carbs they actually burn when running and what that means for their marathon performance.
If you love The Running Channel, why not check out our other channels, filled with more content which we think you’ll love:
*TRC Gear: Your one-stop-shop for all things gear and tech: youtube.com/@TRCGear/?sub_confirmation=1
*TRC Podcast: The world’s biggest running podcast: youtube.com/@therunningchannelpodcast/?sub_confirmation=1
*TRC Club: The social media app designed especially for runners: therunningchannelclub.com/join-us
What’s in this video?
00:00 Intro: Testing Marathon Fueling Needs
00:37 Phase 1: Lactate Threshold Test
02:21 Phase 2: VO2 Max Test
04:31 Phase 3: Carb Oxidation Test Explained
07:37 Results: Carb Use for Different Runners
08:59 Science Behind Carb Burn Rates
09:35 Mark's and Tom's Fueling Results
11:50 Differences for Female Athletes
12:14 Summary: Takeaways for Every Runner
MUSIC licensed by Artlist and Epidemic Sound
--------------------
Thank you to our partners:
Wearables Partner: Garmin - garmin.com
Training Partner: Runna - Want to give Runna a try? Click below for a 2-week FREE trial: web.runna.com/redeem?code=TRC26
Nutrition Partner: Science in Sport (SiS) - scienceinsport.com
Treadmill Partner: Wahoo - uk.wahoofitness.com
--------------------
Follow us on socials:
→ INSTAGRAM - instagram.com/runningchannel ←
→ TRC GEAR INSTAGRAM - instagram.com/trcgear
→ FACEBOOK - facebook.com/OfficialRunningChannel ←
→ STRAVA - strava.com/clubs/runningchannel ←
Or get in touch with us by sending an email to hello@therunningchannel.com
Read this far? Thanks! Please like this video, SUBSCRIBE and share us with your running friends. We would really appreciate it!
Check out our Editorial Policy here: therunningchannel.com/editorial-policy
