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Adam Seal

Adam Seal

Maverick Jurassic Coast X-Trail (54k)

17th October, 2026EnglandCorfe CastleCompleted, M25-29

Adam's headline numbers

~101g
Carb per hour
Recommended 90g/h+
~859ml
Fluid per hour
Recommended 500-1,000ml/h
~900mg
Sodium per litre
Recommended 1000-1400mg/L
~5.3mg
Caffeine per kg
Recommended 3-6mg/kg

Adam's strategy

Fueling

Carbohydrate is the main fuel you burn when racing. Failing to fuel properly is a leading cause of underperformance in longer races.
Carb-rich meal

T - 1-4hrs: Ate a carb rich meal (Low in fat & fibre)

Pre-fueled

T - 15mins: Took in a final dose of carb

Carb per hour
Recommended 90g/h+
~101g
Adam's Energy Rating7/10

"I had high energy throughout the start and middle of the race. It started to drop towards the end but not significantly."

Our thoughts

Adam from our Athlete Support team is a seasoned ultra runner, and he’s refined his fueling plan through experience. He started with PF Carb Only Drink Mix that he carried in his soft flask, then moved onto PF 30 Gels, PF 90 Gels, and PF 30 Caffeine Gels, which he mostly picked up at aid stations on-course, to cover his carb intake. Getting such a high carb intake for nearly 6 hours is impressive work, and is testament to the gut training Adam has done to be able to tolerate this. Energy dips towards the end of a ~6 hour race are expected due to both physical and mental fatigue, in Adam’s case it is likely not down to his fueling strategy as this was spot on.

Hydration

Taking on board an appropriate amount of fluid and sodium is essential to maintaining blood volume and supporting the cardiovascular effort needed to perform on race day.

Whilst the absolute amount of sodium and fluid consumed per hour is important, it’s critical to consider these in relation to each other. This is known as 'relative sodium concentration' and it’s expressed in milligrams per litre (mg/L). How much sodium you’re taking in per litre of fluid is more important than the absolute amount taken in per hour.

Adam1249mg/L

Adam has been Sweat Tested to dial in his hydration plan

Sweat sodium concentration (mg/L) is largely genetically determined and remains relatively stable. Knowing how salty your sweat is enables you to replace a good proportion of your sweat losses, which can range from 200-2,000mg/L.

Given Adam's losses are High (1,249mg/L), nailing his hydration strategy remains important, even when it's Mild.

Learn more
Pre-loaded electrolytes

T - 60mins: Drank ~500ml of strong electrolyte drink

Fluid per hour
Recommended 500-1,000ml/h
~859ml
Sodium per litre
Recommended 1000-1400mg/L
~900mg
Adam's Hydration Rating6/10

"I was pretty well hydrated for the first few hours, but my strategy started to slip towards the end. I think fatigue played a part and I just wasn’t as diligent as I should have been."

Our thoughts

Despite his 6/10 hydration rating, Adam’s fluid intake was strong, and he sat within the 500ml to 1 litre per hour recommended ideal based on what we would model his sweat rate given the race conditions and intensity. He managed to consume 5L of fluid, mostly from refilling his Soft Flask with water at aid stations. As he tired, his adherence to his hydration plan faltered slightly. Having an alert on his watch which reminds him every 20-30 minutes to drink could be a strategy for future races, to help him stay on track despite the physical fatigue.

Adam has had a Sweat Test to dial in the sodium lever of his strategy. Knowing that he is a salty sweater, he has to be proactive with his sodium replacement to make sure he retains the fluid he is taking on and replaces enough of his losses, though this is where his strategy fell just below the recommended range. Adam opted to supplement plain water with Electrolyte Capsules - taking 16 across his 50km race. Taking an extra Electrolyte Capsules for each Soft Flask of plain water (three per flask) would bring the relative concentration of his drinks closer to the concentration he loses in his sweat.

Caffeine

Beyond the Three Levers of Performance (carb, sodium and fluid), caffeine is one of only a few substances that is proven to improve performance for most endurance athletes as it can help stave off mental and physical fatigue.

Pre-caffeinated

T - 0-4hrs: Had a final hit of caffeine

Caffeine per kg
Recommended 3-6mg/kg
~5.3mg
Our thoughts

Adam did well to dose his caffeine evenly from the start line of the race using four PF 30 Caffeine Gels to sit in the 3-6mg/kg range associated with performance benefits.

How Adam hit his numbers

Here's everything that Adam ate and drank on the day...

Before race (>30 mins)
Pre-race (<30 mins)
During

Final thoughts

Adam's Satisfaction Rating8/10

“It was amazing to complete such a tough challenge but I feel that with a better hydration strategy towards the back end of the race, I could have gone a little faster.”

Adam

“Adam had a really strong day out on the Jurassic Coast, and there are just a few tweaks he might want to consider ahead of his next ultra. Managing his sodium intake to more closely match what he is losing would benefit his hydration strategy for his next races, especially as he moved to Australia after this race and will likely have to deal with hotter conditions ‘Down Under’!”

PF&H

Adam's full stats

Overall
589g total carb101g per hour
5,000ml total fluid859ml per hour
4,502mg total sodium774mg per hour
900mgSodium per litre
400mg total caffeine5.3mg per kg

Data Confidence

We rate each of our case studies from 1-5 based on the level of accuracy, and our confidence in the data.

12345

There is an adequate level of accuracy in the data collected and the numbers reported. The athlete manages to recall what they ate and drank including most specifics (brands flavours quantities plausible estimations of volumes). However there are estimations made within the data which affect the overall confidence level in the data reported.

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