OCR and Spartan race-day fuel plan
OCR (obstacle course racing) mixes intermittent running with maximal strength bursts. Unlike trail, there are explosive moments (rope climb, monkey bars) that drain glycogen quickly, and the terrain rarely lets you stop to eat.
Spartan Sprint, Super, Beast, Ultra
Sprint (~5 km, 30-60 min): 1 pre-start gel is enough. Super (~10 km, 1-2h): 30-45 g/h, 1-2 gels during. Beast (~21 km, 2-4h): 45-60 g/h, gels every 30 min with 2:1 blend. Ultra (50 km+, 6h+): 60-90 g/h, with real food at stations.
How to carry food
In OCR there are no traditional short pockets, obstacles tear them. A running belt with 2-3 gel flasks or a stretch pouch glued to the body is the most common solution. Each gel must be packaged so it opens easily with gloves or muddy hands. Tab packaging is safer than pinch-tear.
Typical OCR mistakes
Mistake one: eating during an obstacle. The right moments are between obstacles while running. Mistake two: excessive hydration, in OCR, 500 ml of water + a few sips at stations usually covers 2h. Mistake three: high-dose caffeine before a technical obstacle (rig, monkey bars), it can increase fine tremor and hurt grip.
Gear for carrying food in OCR
Traditional short pockets tear in rope climb and wall climb. Tested options: a Naked Belt-style running belt holds 2-3 gel flasks and 1 soft 200 ml water flask, comfortable to run with and secure on obstacles. Body-glued elastic pouch (SPIBelt style) survives mud crawl without losing contents, but limited capacity (1-2 gels). A small vest like the Salomon Sense Pro 5L is ideal for Beast/Ultra: more hydration and food capacity, but it rubs on monkey bars and can be uncomfortable on multi-rig. Tab packaging (Maurten, SiS) opens more easily than pinch-tear (GU) with gloves or muddy hands.
Caffeine and grip: why high doses sabotage rope climb
Caffeine doses above 3 mg/kg increase fine motor tremor, measurable on a handgrip dynamometer. In OCR, rope climb, monkey bars and multi-rig depend 100% on grip strength + endurance. Recommendation: low dose (1-2 mg/kg) or skip caffeine in the 90 min before a known technical obstacle. In long events (Beast 21 km, Ultra 50 km), a 1-2 mg/kg top-up after the last technical obstacles leaves only the final run, where the caffeine boost is pure benefit with no motor cost.