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Unfold a world of endurance

Stories, science and field notes from the OLEUS community — athletes pushing their boundaries, and the science behind their next breakthrough.

Running in the heat: What actually protects your cells

Running in the heat: What actually protects your cells

Heavy legs on easy runs: Why recovery pace fails

Heavy legs on easy runs: Why recovery pace fails

Priming your nervous system before a time trial

Priming your nervous system before a time trial

OLEUS PERFORMANCE LAB

10K to Half Marathon: Where the fueling rules change

10K to Half Marathon: Where the fueling rules change

Olive leaf extract for ultra runners: What 6 hours actually does

Olive leaf extract for ultra runners: What 6 hours actually does

The 60 minutes before a half marathon: What matters

The 60 minutes before a half marathon: What matters

Swimmer resting at the wall between hard reps, showing the recovery gap in a main set

The recovery mistake swimmers make between hard sets

Antioxidant gels vs Olive leaf extract for cyclists

Antioxidant gels vs Olive leaf extract for cyclists

Cyclist warming up on a misty rural road before a hard interval session

What to do in the hour before a hard interval ride

What to eat before a marathon: Night before to start line

What to eat before a marathon: Night before to start line

Why 8 Hours of Sleep Still Leaves Runners Tired

Why 8 Hours of Sleep Still Leaves Runners Tired

Why your power fades three hours into a long ride

Why your power fades three hours into a long ride

Why the run stations are where your HYROX falls apart

Why the run stations are where your HYROX falls apart

Why your pace fades in the back half of a swim set

Why your pace fades in the back half of a swim set

Why your energy disappears halfway through a gym session

Why your energy disappears halfway through a gym session

Why you keep losing the third set on the padel court

Why you keep losing the third set on the padel court

Why your legs feel heavy when you run

Why your legs feel heavy when you run

athlete hitting the wall on a mountain climb, a cellular energy gap.

Why you hit the wall, and what your cells have to do with it

The cellular energy system: building the engine daily and igniting it on race day.

Build and boost: the cellular energy system for any sport, any level

Athlete preparing at dawn, the cellular energy engine that powers every sport.

Your cellular engine: what ATP actually is, and why every sport runs on it

Running in the heat: nutrition, pacing and performance

Running in the heat: nutrition, pacing and performance

European Ultra Running Events 2026: 10 Races Worth Entering

European Ultra Running Events 2026: 10 Races Worth Entering

Why gym pre-workouts fail endurance athletes

Why gym pre-workouts fail endurance athletes

The protein mistake most endurance runners make

The protein mistake most endurance runners make

Can too many antioxidants slow you down?

Can too many antioxidants slow you down?

Why female endurance athletes run low on iron

Why female endurance athletes run low on iron

How to read a Pre-Activity label and spot the red flags

How to read a Pre-Activity label and spot the red flags

Why are you still tired while your bloodwork is 'normal'?

Why are you still tired while your bloodwork is 'normal'?

What to do in the 60 minutes before a long ride

What to do in the 60 minutes before a long ride

Which antioxidants actually reach your muscles?

Which antioxidants actually reach your muscles?

Creatine for runners: Does it help endurance?

Creatine for runners: Does it help endurance?

Triathlon nutrition: fuel swim, bike and run without bonking

Triathlon nutrition: fuel swim, bike and run without bonking

How many carbs per hour should you take in a marathon

How many carbs per hour should you take in a marathon

Your pre-race morning routine: Breakfast, warm-up, priming

Your pre-race morning routine: Breakfast, warm-up, priming

HRV for endurance athletes: What the low scores actually mean

HRV for endurance athletes: What the low scores actually mean

What to eat the night before a race

What to eat the night before a race

Why fatigue goes deeper than tired muscles

Why fatigue goes deeper than tired muscles

The runner's meal plan: Training, recovery and race day

The runner's meal plan: Training, recovery and race day

The marathon taper: How to arrive fresh, not flat

The marathon taper: How to arrive fresh, not flat

What to eat before a 5K in the morning

What to eat before a 5K in the morning

Endurance nutrition: the complete guide for runners and triathletes

Endurance nutrition: the complete guide for runners and triathletes

Food before running: timing, carbs, and common mistakes

Food before running: timing, carbs, and common mistakes

Why you feel fatigued after running: causes beyond tired muscles

Why you feel fatigued after running: causes beyond tired muscles

Carb loading before a marathon: what actually works

Carb loading before a marathon: what actually works

Electrolytes for runners: what they do and what they do not solve

Electrolytes for runners: what they do and what they do not solve

Marathon nutrition plan: before, during, and after race day

Marathon nutrition plan: before, during, and after race day

Magnesium for runners: energy, sleep, and muscle function

Magnesium for runners: energy, sleep, and muscle function

Best supplements for runners: what helps and what is hype

Best supplements for runners: what helps and what is hype

Energy gels for runners: what they do and what they do not solve

Energy gels for runners: what they do and what they do not solve

Heavy legs while running: nutrition, recovery, and cellular fatigue

Heavy legs while running: nutrition, recovery, and cellular fatigue

DISCLAIMER

¹Carbohydrate-electrolyte solutions contribute to the maintenance of endurance performance during prolonged endurance exercise.

²L-Carnitine helps to maintain energy levels for prolonged periods during intense competition/exercise. Enhances endurance and helps to maintain peak effort during times of high physical demand. L-carnitine makes energy metabolism more effective and protects cell energy metabolism.

³Magnesium contributes to normal muscle function, contributes to a reduction of tiredness and fatigue, and electrolyte balance.

⁴Vitamin C is necessary to maintain energy and general vitality and contributes to the reduction of tiredness and fatigue. Vitamin C is a cofactor in the synthesis of carnitine, which plays a role in energy production in the mitochondria. Vitamin C contributes to the protection of cells from oxidative stress, and to maintain the normal function of the immune system during and after intense physical exercise.

⁵Ginseng supports physical and mental health/recovery, and cognitive and mental performance.

⁶Whey protein provides fast delivery of muscle-building amino acids after training to aid recovery and support muscle growth.

⁷Calcium contributes to the normal functioning of cells.

⁸BCAAs support the improvement of muscle fatigue recovery after exercise.

⁹Acerola is a major dietary source of antioxidants. Contributes to the protection against free radicals which cause cell damage, and the protection of cells and tissues from oxidative damage.

¹⁰Sodium phosphate supplementation increases maximum oxygen uptake in endurance athletes.

¹¹Citrulline-malate supports the maintenance of ATP levels through the reduction of lactates in excess for improved recovery from muscle fatigue.

¹²Vitamin D contributes to the maintenance of normal muscle and immune function.

¹³Guaran is a source of energy / helps to make you feel more energetic and suppresses fatigue.

¹⁴Olive leaf extract (Oleuropein) titrated in Oleuropein has antioxidant activity.

¹⁵Vitamin B12 contributes to the reduction of tiredness and fatigue.

¹⁶Vitamin C & B6 and Magnesium contribute to a normal energy-yielding metabolism.

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