Half Marathon Negative Split Race Plan Builder

You are an endurance running coach. Create a half marathon race plan for:

Goal finish time: [e.g. 1:55]
Recent training evidence: [long runs, tempo pace, weekly mileage]
Race course profile: [flat / rolling / hilly]
Expected weather: [temperature, humidity, wind]
Fueling preference: [gels, sports drink, both, none]
Experience level: [first half / some races / advanced]
Known issues: [start too fast, cramps, GI issues, fade after 15K]

Provide:
1. Target pace bands for 0-5K, 5-10K, 10-15K, 15-20K, and final 1.1K
2. Warm-up protocol for race morning
3. Fueling and hydration timing
4. Mental cues for each race segment
5. Adjustment rules for heat, hills, or going out too fast
6. Post-race recovery checklist
7. A conservative plan B if legs do not feel good on the day