I Ran 4 Marathons in 2 Years and Never Once Hit the Wall.
The fix had nothing to do with my training plan, my shoes, or my diet. It was the one variable I’d been ignoring for years, hydration.
THE RUNNING JOURNAL
By Matt Jones | February 2026 | Sponsored
The problem nobody talks about
I was 34, running five days a week, and doing everything by the book.
Tempo runs on Tuesdays. Long runs on Sundays. Proper fuelling. Eight hours of sleep. I tracked every metric, heart rate zones, cadence, weekly mileage. I even bought a WHOOP strap to monitor my recovery.
And still, something was off.
Easy runs didn’t feel easy. My heart rate would creep up by kilometre 8 for no apparent reason. I’d finish a session feeling more drained than the effort warranted. And the worst part? My long runs kept falling apart in the final third. Not dramatically, no injury, no bonk, no collapse. Just a slow, quiet fade. Pace slipping. Legs heavy. The kind of decline you can’t quite explain to your coach because there’s nothing technically wrong.
I started to wonder if this was just what getting older felt like.
I talked to other runners at my club. Same story. “I just lose it at mile 18.” “My easy runs have felt hard all winter.” “I’m sleeping eight hours and still waking up tired.” Nobody had an answer. The default advice was always the same: rest more, eat more carbs, back off the volume.
So I did all of that. Nothing changed.
"Marathon plans don’t fail loudly. They fade. And by the time you notice, you’ve lost weeks of progress you can’t get back."
— Running coach, after reviewing my training log
— Running coach, after reviewing my training log
I went down the research rabbit hole. Blood tests came back normal. Iron fine. Thyroid fine. Sleep was solid. The answer wasn’t in any of the obvious places.
Then I found a study on exercise-associated hyponatremia and the role of electrolyte balance in endurance performance. It referenced something I’d never paid attention to: the relationship between plasma volume, sodium concentration, and cardiovascular efficiency during sustained effort.
What changed everything
I’d tried electrolyte products before. Tabs from the supermarket. A tub of powder a friend recommended. Whatever was on offer at the expo. They all felt the same, a sugar-loaded sports drink dressed up with a modern label. I’d use them before a race and forget about them for the other 360 days of the year.
That’s when a physio I trust mentioned Cadence.
What caught my attention wasn’t a bold claim or a sponsored post. It was the framing.
He didn’t say “this will make you faster.” He said: “Most hydration products only help you during the workout. Cadence is built for the other 23 hours too.”
That reframed the entire conversation for me. I’d been thinking about hydration as something I did during exercise. Cadence treats it as a 24-hour system.
Three products, each designed for a different phase of the day:
It was the first electrolyte brand I’d come across that acknowledged a simple truth: what you do between sessions matters as much as what you do during them. Hydration isn’t a pre-run checklist item. It’s infrastructure.
I started with the Core sachets:
One every morning, mixed into a glass of water before coffee.
No taste drama, lightly flavoured, not sweet.
Dissolves fast. Takes about 10 seconds to make.
The kind of thing that slides into a morning routine without friction, which matters because if it’s a hassle, you stop doing it within a week.
What happened next
I’m not going to tell you I felt like a different person on day one. I didn’t. It’s an electrolyte sachet, not a performance-enhancing drug. But by the end of the second week, I noticed something I hadn’t felt in months.
The sleep piece surprised me most. I added the Sleep sachet about three weeks in, half-expecting nothing. But I started waking up without that heavy, unrested feeling I’d chalked up to training fatigue.
My WHOOP recovery scores crept up, not dramatically, but steadily. 5-8% higher on average. Enough that my weekly strain capacity increased without changing anything else.
James, 38
Manchester, UK
"I used to grab whatever random powder was trending and hope for the best. Since switching to Cadence, I’ve knocked 11 minutes off my marathon PB. Not because it made me faster. Because it made me consistent."
— James, 38 | Manchester, UK
Sarah, 31 Bristol, UK
"The biggest change was my recovery between sessions. I train 6 days a week and I’m not dragging myself to Thursday’s run anymore. That’s the difference."
— Sarah, 31 | Bristol, UK
Tom, 42 Denver, US
"I was sceptical about the Sleep formula. Genuinely. But my Garmin sleep scores have been measurably better since I started. I didn’t change anything else."
— James, 38 | Manchester, UK
James, 38
Manchester, UK
"I used to grab whatever random powder was trending and hope for the best. Since switching to Cadence, I’ve knocked 11 minutes off my marathon PB. Not because it made me faster. Because it made me consistent."
— James, 38 | Manchester, UK
Sarah, 31 Bristol, UK
"The biggest change was my recovery between sessions. I train 6 days a week and I’m not dragging myself to Thursday’s run anymore. That’s the difference."
— Sarah, 31 | Bristol, UK
Tom, 42 Denver, US
"I was sceptical about the Sleep formula. Genuinely. But my Garmin sleep scores have been measurably better since I started. I didn’t change anything else."
— Tom, 42 | Denver, US
Six months in, here’s what the before and after actually looks like for me:
BEFORE
AFTER
Heart rate drifting 12-15bpm on easy runs
Heart rate stable within 3-4bpm all session
Long runs falling apart after 22km
Finishing 30km+ runs with control
Waking up heavy and unrested
Waking up feeling genuinely recovered
Inconsistent week-to-week performance
Predictable sessions, week after week
WHOOP recovery averaging 42%
WHOOP recovery averaging 58%
Try the Starter Variety Pack
Save 30%
on your first order with the code “FIRST”
SHOP THE Hydration Stack →
What I was sceptical about
Dave, 44 Leeds, UK
"I’m 44 and I was about to accept that my running days were numbered. 8 weeks on Cadence and I just ran my fastest 10K since 2019. My wife asked what I’d changed. Honestly? Just this."
— Dave, 44 | Leeds, UK
Rachel, 36 Edinburgh, UK
"I’ve tried LMNT, Nuun, SiS, Hi5. They all sit in my cupboard half-used. Cadence is the first one I’ve subscribed to because it’s the first one where I actually noticed the difference day to day."
— Rachel, 36 | Edinburgh, UK
Liam, 29 Dublin, IE
"Bought the Variety Pack after seeing it recommended in a running group. Three weeks in and my coach commented that my session consistency had improved. I hadn’t told him I’d changed anything."
— Liam, 29 — Dublin, IE
Dave, 44 Leeds, UK
"I’m 44 and I was about to accept that my running days were numbered. 8 weeks on Cadence and I just ran my fastest 10K since 2019. My wife asked what I’d changed. Honestly? Just this."
— Dave, 44 | Leeds, UK
Rachel, 36 Edinburgh, UK
"I’ve tried LMNT, Nuun, SiS, Hi5. They all sit in my cupboard half-used. Cadence is the first one I’ve subscribed to because it’s the first one where I actually noticed the difference day to day."
— Rachel, 36 | Edinburgh, UK
Liam, 29 Dublin, IE
"Bought the Variety Pack after seeing it recommended in a running group. Three weeks in and my coach commented that my session consistency had improved. I hadn’t told him I’d changed anything."
— Liam, 29 — Dublin, IE
Now stocked in:
Now sNot a bedroom brand. Vetted, tested, and trusted by the retailers who know this category.tocked in:
The science in plain english
Most people think hydration is about drinking enough water. It’s not. It’s about electrolyte balance.
This is why drinking more water can actually make the problem worse. Without electrolytes, extra water just dilutes what’s already too low.
Think of it like a battery. Water is the casing. Electrolytes are the charge inside. A bigger casing without more charge doesn’t give you more power. It gives you a weaker current.
500
mg Sodium
Supports nerve signalling and
muscle contraction
190
mg Sodium
Supports nerve signalling and
muscle contraction
60
mg Magnesium
Reduces cramping and supports overnight muscle recovery
Most electrolyte brands dose sodium at 100-250mg per serving. Research on endurance athletes suggests 400-700mg is closer to what’s needed to maintain performance during sustained effort. Cadence formulates at 500mg, within the evidence-based range, without the gastrointestinal issues that come from overdoing it.
The Sleep formula uses Magnesium Glycinate specifically because it’s the form most readily absorbed and least likely to cause digestive discomfort. The L-Theanine is dosed at 200mg, the amount used in clinical research on sleep quality improvement. These aren’t token inclusions. They’re functional doses.
No Sugar Electrolyte Hydration
No artificial colours
No proprietary blends hiding underdosed ingredients
The offer : Start With The Starter Hydration System
If you’re not sure where to begin, this is the play. The Starter System includes Core, Race, and Sleep, enough to run the full 24-hour protocol for a month and see for yourself whether it makes a difference.
Use code FIRST for 30% off your first order
Subscribe & Save up to 46% on ongoing orders
Free shipping on all subscription orders
Skip, pause, or cancel your subscription anytime
That’s less than $2.57/day for the full system. Less than the coffee you’re buying to cover the energy you shouldn’t be losing in the first place. Plus the Starter System frequently sells out during peak training season!
GET YOUR FIRST ORDER AT
30% OFF
Use code FIRST at checkout
GET THE STARTER HYDRATION SYSTEM →
Cancel anytime
30-day guarantee
Free shipping
EDITORIAL DISCLOSURE
This article is sponsored by Cadence Hydration. All opinions and experiences shared are based on genuine product use. Results may vary. Cadence products are not intended to diagnose, treat, cure, or prevent any disease. Consult your healthcare provider before starting any new supplement regimen.