Negative Split Running Strategy

Teach me to run negative splits consistently.

My current racing pattern:
- Typical race pattern: [start fast and fade, even, etc.]
- Recent race splits: [if available]
- Pacing tools: [watch, feel, etc.]
- Race distances: [what I typically race]
- Main challenge: [starting too fast, fading, etc.]

Please cover:
1. What negative splits are and why they matter
2. Psychological barriers to pacing
3. Training runs to practice negative splits
4. Pacing strategies for different distances
5. Using heart rate for pacing
6. Managing race day adrenaline
7. Course-specific considerations
8. Workout structure for negative split practice
9. When negative splits aren't ideal
10. Famous negative split performances for inspiration