MileSplit Staff Apr 03, 2026 PRO See the rest of this article Access the complete article with MileSplit PRO. Subscribe to keep reading Already a subscriber? Log in. Improvement Rankings: Top Colorado Boys 400m marks compared to their season’s best performances from 2025. Most Improved - 400 Meter Dash Comparing 2026 season to 2025 season Rank Improved Athlete/Team Class 2025 PR 2026 PR 1 -16.45 Nick Clark Soroco High School 2026 1:14.37 57.92 2 -15.06 Gage Nielsen Rangely High School 2026 1:23.42 1:08.36 3 -13.78 Joshua Martinez Greeley Central High School 2026 1:18.45 1:04.67 4 -12.95 Tegan Damers Lotus School for Excellence High School 2026 1:13.92 1:00.97 5 -11.21 Jasiah Alvarez Delta High School 2028 1:09.78 58.56 6 -9.63 ...