Uploaded July 2026 | Updated September 2026, 1 day ago
Are we hydrating properly? Tom and Sarah put their bodies to the test to uncover the truth about hydration and reveal what many runners might be getting wrong.
Supported by SiS, we’ve come to Loughborough University where Tom and Sarah take on a brutal sweat test in an environmental chamber to measure how much they sweat, to look at how dehydrated we get when we’re running, how much sodium we lose when we run, how it might impact your performance and what you should do (or not do) about it. And ultimately answer the question of when do we actually need electrolytes?
For more information about the services and facilities at Loughborough University, click the link below: lboro.ac.uk/sport/support-services/physiology/?utm_source=youtube-description&utm_medium=running-channel&utm_campaign=heat-prep-running-channel
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* 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 - Are Electrolytes worth it? 00:29 - How the sweat test works
02:18 - The test at optimum temperature
03:35 - How to calculate your sweat loss
04:13 - How the test felt
4:59 - The results at optimum temperature
06:29 - The sweat test at 25 c
08:12 - The effect of running in the heat
10:15 - The results
11:05 - Hydration advice
12:30 - Can electrolytes help?
12:52 - When are electrolytes useful?
13:50 - Risks of electrolyte tablets
14:23 - How keeping hydrated improves running
15:32 - Be mindful when hydrating
15:49 - Do we actually need electrolytes?
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
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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
Are we hydrating properly? Tom and Sarah put their bodies to the test to uncover the truth about hydration and reveal what many runners might be getting wrong.
Supported by SiS, we’ve come to Loughborough University where Tom and Sarah take on a brutal sweat test in an environmental chamber to measure how much they sweat, to look at how dehydrated we get when we’re running, how much sodium we lose when we run, how it might impact your performance and what you should do (or not do) about it. And ultimately answer the question of when do we actually need electrolytes?
For more information about the services and facilities at Loughborough University, click the link below: lboro.ac.uk/sport/support-services/physiology/?utm_source=youtube-description&utm_medium=running-channel&utm_campaign=heat-prep-running-channel
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 - Are Electrolytes worth it? 00:29 - How the sweat test works
02:18 - The test at optimum temperature
03:35 - How to calculate your sweat loss
04:13 - How the test felt
4:59 - The results at optimum temperature
06:29 - The sweat test at 25 c
08:12 - The effect of running in the heat
10:15 - The results
11:05 - Hydration advice
12:30 - Can electrolytes help?
12:52 - When are electrolytes useful?
13:50 - Risks of electrolyte tablets
14:23 - How keeping hydrated improves running
15:32 - Be mindful when hydrating
15:49 - Do we actually need electrolytes?
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
