---
title: "Sub-2:00 Half Marathon Pacing Strategy & GU & SiS Isotonic Fueling (Rolling Hills & Bridges)"
h1: "Sub-2:00 Half Marathon Half Marathon Splits & GU & SiS Isotonic Timetable (Rolling Hills & Bridges)"
vertical: pace_forge
vertical_slug: marathon-pacing
slug: sub-2-00-rolling-hills-gu-sis-split-card
canonical_url: https://exactbaseline.com/p/marathon-pacing/sub-2-00-rolling-hills-gu-sis-split-card
authority_sources: "Jack Daniels VDOT O2 Cost Formula & ACSM Endurance Guidelines"
governing_formula: "VO2 = -4.60 + 0.182258v + 0.000104v^2 (Jack Daniels VDOT)"
buy_instant_action_pass_url: "https://exactbaseline.com/buy/pace_forge/flash_pass?recent_distance=5k&recent_time_minutes=25.8&target_race=half_marathon&weekly_mileage=medium&gel_brand=gu_sis&course_elevation=rolling_hilly"
buy_complete_execution_kit_url: "https://exactbaseline.com/buy/pace_forge/full?recent_distance=5k&recent_time_minutes=25.8&target_race=half_marathon&weekly_mileage=medium&gel_brand=gu_sis&course_elevation=rolling_hilly"
buy_pro_advisor_pass_url: "https://exactbaseline.com/buy/pace_forge/pro_b2b?recent_distance=5k&recent_time_minutes=25.8&target_race=half_marathon&weekly_mileage=medium&gel_brand=gu_sis&course_elevation=rolling_hilly"
---

# Sub-2:00 Half Marathon Half Marathon Splits & GU & SiS Isotonic Timetable (Rolling Hills & Bridges)

> **Direct Answer (Jack Daniels VDOT O2 Cost Formula & ACSM Endurance Guidelines):** Calibrated via the Jack Daniels VDOT O2 Cost Formula & ACSM Endurance Guidelines (VO2 = -4.60 + 0.182258v + 0.000104v^2), achieving 2h 00m 49s (VDOT 36.9) requires a 9:13/mile target pace, passing the 13.1-mile halfway checkpoint at 1h 00m 29s on a 51/49 negative split with 60g to 90g/hour carbohydrate fueling via Gu Sis hydrogels.

## Deterministic Governing Formula

- **Formula:** `VO2 = -4.60 + 0.182258v + 0.000104v^2 (Jack Daniels VDOT)`
- **Authoritative Sources:** Jack Daniels VDOT O2 Cost Formula & ACSM Endurance Guidelines
- **Interactive Calculator:** [Open Live PaceForge Calculator](https://exactbaseline.com/calculator/pace_forge?recent_distance=5k&recent_time_minutes=25.8&target_race=half_marathon&weekly_mileage=medium&gel_brand=gu_sis&course_elevation=rolling_hilly)

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## 3-Step Calculation Methodology

1. **Calibrate VDOT Aerobic Threshold:** Map your recent race benchmark to VDOT 36.9 using the Jack Daniels O2 cost equation to establish your 9:13/mile marathon cadence.
2. **Lock 51/49 Negative Split Pacing Gates:** Cap Miles 1-3 at 9:16/mi to pass the 13.1-mile halfway mark at 1h 00m 29s before dropping to 9:10/mi after Mile 14.
3. **Execute Scheduled Hydrogel Fueling:** Ingest 60g-90g/hour of carbohydrates via Gu Sis packets every 3.5 miles to prevent late-race glycogen depletion at Mile 20.

## Marathon & Half-Marathon Milestone Split & Carbohydrate Fueling Checkpoint Table

| Race Checkpoint | Distance | Cumulative Split Clock | Segment Pace Target | Carbohydrate Intake (ACSM) |
| --- | --- | --- | --- | --- |
| 5K Gate | 3.1 Miles | 0:28:47 | 9:16/mi (Conservation) | 25g Pre-Race Gel (-15 min) + 25g at Mile 3.5 |
| 10K Gate | 6.2 Miles | 0:57:34 | 9:16/mi (Aerobic Cap) | 50g Cumulative (2x Hydrogel + 250ml Fluid) |
| Halfway Split | 13.1 Miles | 1h 00m 29s | 9:13/mi (Threshold Transition) | 100g Cumulative (4x Gel @ 60g-75g/hr rate) |
| Mile 20 Wall Gate | 20.0 Miles | 3:04:20 | 9:10/mi (Negative Split Push) | 150g Cumulative (6x Gel + 100mg Caffeine) |
| Finish Line | 26.2 Miles | 2h 00m 49s | 9:10/mi (Final 10K Kick) | 175g-200g Total Exogenous CHO Oxidation |

## Frequently Asked Questions (FAQ)

### Q: What pace per mile is required for Sub-2?
To achieve a 2h 00m 49s finish (VDOT 36.9), your average cruising pace is 9:13 per mile. Under a 51/49 negative split model, run Miles 1 to 13.1 at 9:16/mi (crossing halfway at 1h 00m 29s) and accelerate to 9:10/mi over the final 13.1 miles.

### Q: 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 Gu Sis 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).

### Q: Why does banking +3 seconds per mile in the first 5K prevent hitting the Mile 20 wall?
Running 5% faster than 9:13/mi in the opening 5K spikes blood lactate and accelerates hepatic and muscular glycogen depletion by up to 24%. Holding 9:16/mi through Mile 3 preserves glycogen stores for the Mile 20 to 26.2 negative-split kick.

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