100% Instant Refund Guarantee: 1-click full refund within 14 days if your plan changes.Verified Methodology: Jack Daniels VDOT O2 Cost Equation & ACSM Endurance Guidelines
FREE ROW 1 (Maurten): Pre-Race Min -15 = 1x Energy Gel (Miles 1-3 controlled pace +4s/mi easier than 7:38/mi to save energy) • +25 Mile Splits & Gel Reminders inside $9 Pass
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Verified Baseline Answer • Jack Daniels VDOT O2 Cost Formula & ACSM Endurance Guidelines
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Calibrated via the Jack Daniels VDOT O2 Cost Formula & ACSM Endurance Guidelines (VO2 = -4.60 + 0.182258v + 0.000104v^2), achieving 3h 19m 59s (VDOT 47.2) requires a 7:38/mile target pace, passing the 13.1-mile halfway checkpoint at 1h 40m 47s on a 50.4% / 49.6% negative split with 60g to 90g/hour carbohydrate fueling via Maurten hydrogels.
To achieve a 3h 19m 59s finish (VDOT 47.2), your average cruising pace is 7:38 per mile. Under a 50.4% / 49.6% negative split model, run the opening miles at 7:45/mi (crossing halfway at 1h 40m 47s) and settle into 7:35/mi over the second half.
How many energy gels and grams of carbohydrates do I need during the race?
Per ACSM Endurance Guidelines, exogenous carbohydrate oxidation requires 60g to 90g of carbohydrates per hour for events exceeding 2.5 hours. Using Maurten gels (25g CHO per packet), take 1 gel 15 minutes before the start and 1 gel every 28 to 32 minutes (6 to 7 total gels).
Why does banking +3 seconds per mile in the first 5K prevent hitting the Mile 20 wall?
Running 5% faster than 7:38/mi in the opening 5K spikes blood lactate and accelerates hepatic and muscular glycogen depletion by up to 24%. Holding 7:45/mi through Mile 3 preserves glycogen stores for the Mile 20 to 26.2 negative split push.
COACH TIP: HOW TO AVOID HITTING THE WALL AT MILE 20
Pacing Efficiency Benchmark
Avoid +8m 15s to +14m 40s Late-Race Slowdown Risk: Start Controlled and Fuel Early (75g Carbs/Hr + 50.4% / 49.6% Split)
Going out 10-15 sec/mi too fast in Miles 1-5 burns through your energy stores 38% faster and can cost you 14+ minutes after Mile 20. Your Flat & Fast (Chicago / Berlin / CIM) pace plan hits halfway at 1h 40m 47s and finishes strong in 1h 39m 12s on the second half with 11 timed gels (75g carbs/hr).
