The number every runner should know but doesn't

Huge thank you to Precision Fuel and Hydration for sponsoring this video. Head to their website to fill out the free questionnaire or book a sweat test at one of their labs:
visit.pfandh.com/lovethegrind

Most runners think about sweat as one data point. Drink more, job done. But it's actually two completely separate numbers and getting either one wrong is the reason you cramp up, fade in the heat or worse.

I went to Precision Fuel and Hydration HQ in Dorset and did two full threshold sessions in the lab, one in normal conditions and one in a heat chamber cranked to 37 degrees, with lactate testing, sweat rate testing, and sodium concentration testing throughout.

Other useful links from Precisions Knowledge Hub:

Pre loading your hydration: precisionhydration.com/performance-advice/hydration/how-to-start-hydrated-and-why-that-is-important-sodium-preloading-what-to-do-before-a-race-hydration

How to estimate your sodium loss:
precisionhydration.com/performance-advice/hydration/how-to-estimate-sweat-salt-loss

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What's in this video ⬇️
0:00 – Why sweat matters for runners
0:59 – What We're Testing Today and Why
1:32 – The Missing Piece of My Marathon Prep
3:22 – A Tour of thePrecision Fuel and Hydration HQ
4:38 – Session One: 9 Miles of Threshold in the Lab
6:24 – Lactate Testing Explained
6:57 – Sweat Rate vs Sodium Loss: What's the Difference?
8:14 – Session One Done: The Results
8:35 – Newlyweds Salty Edition: The Sodium Test
9:24 – How the Sodium Test Actually Works
9:49 – My Sodium Results: What They Mean
11:40 – What to Do With Your Number on Race Day
13:34 – How to Test Your Sweat Rate at Home
14:36 – Session Two: The Heat Chamber
15:51 – Running at 37 Degrees: What Happened
17:10 – Why You Must Adjust Pace in the Heat
19:23 – Comparing AM and PM Sweat Rates
21:31 – Pulling It All Together: My Numbers
22:54 – What I'm Most Excited About Next
23:33 – How to Get Your Own Data