At the Nike Indoor Nationals championship mile, Abdinasir Hassan ran 4:01.45, breaking the sophomore class record by nearly 6 seconds.

The performance didn't come out of nowhere. It came from a deliberate, patient approach to building fitness. His training structure is built around cut-down sessions, and a mentality centered on one thing: chasing whoever is in front of you.

Watch: PACE 4

Accessory: COROS Heart Rate Monitor

Analysis: Training Hub

Building Volume the Right Way

Abdi is less than two years into his high school career, and his mileage progression reflects a coach and athlete committed to long-term development. As a freshman, he started at just 15–20 miles per week during cross country. That gradually climbed through in the year-and-a-half since: 35 for track, then 45 to start his sophomore year. This winter, he's been averaging 50–55 on full training weeks.

The progression has been steady, intentional, and never forced. "I'm just going to take it one step at a time and focus on what's in front of me," Abdi said.

How the Workouts Are Structured

Abdi's training follows a noticeable pattern: workouts start long and work down to speed. It's a structure designed to build endurance first, then teach the legs to find another gear when they're already tired.

One recent session was 2x1000m at tempo pace, followed by 3x300 and 2x200 around mile pace. Each rep was faster than the last.

Abdinasir Hassan's Track Workout

"I love those workouts where it's tempo at the beginning, then work down to speed," he said. "That's what I love the most."

His higher-volume workouts look very similar: 5K tempo, followed by a set of 400m repeats and a set of 150m sprints. Long runs? 10-11 miles starting at an easy pace and working down to 5:30 pace.

Abdinasir Hassan's Long Run

The type of workout may change, but the idea of "finish fast" remains. Abdi's spedometer only goes in one direction: up. This mentality undoubtedly carries over into racing, where he can unleash one of the deadliest kicks in the country.

Strength training happens twice a week, always right after a workout. The lifts are moderate — squats, RDLs, pogo jumps, and core — and all use specific loads calculated from his bodyweight.

The 4:01 Mile

Abdi went into Nike Indoor Nationals expecting to run around 4:05. His coach thought the same. The first few laps, he struggled to find rhythm and found himself near the back of the field.

"The first couple laps was kind of painful. It took a long time to get into rhythm," he said. "When I finally got to rhythm, it was after like 800."

From there, he started picking off runners. He moved from last to 5th, then to the front of the race. When Marcelo Mantecon made his move over the final two laps, Abdi went with him.

"I kind of went around and just went for it. Everything I had," he said. "Just so much grit — just trying to catch that guy."

Mantecon held on for the win in a meet-record 4:00.66. Hassan's 4:01.45 shattered the previous sophomore class record of 4:07.04.

The interesting thing about the kick is how it felt. At the Millrose Games earlier in the season, Abdi's 4:10 left him completely drained, along with a case of "track hack" so bad he couldn't speak without caughing. The 4:01 was a completely different experience.

"When I ran 4:10, it felt the worst. I hit lactic so hard," he recalled. "And then running 4:01, it was a completely different feeling. It's very weird."

What's Next

With three full outdoor seasons still ahead of him, Abdi is already thinking bigger. This year's targets start with the Bryan Clay Invite, where he plans to race the 800 and 1500, with sub-1:50 and a spot on the all-time 1500 board in his sights. From there, it's off to Runninglane for a fast 2-mile, then the championship circuit at Hoka Festival of Miles and Nike Outdoor.

Despite the results, the approach isn't changing. "I'm just going to focus on what's in front of me — the next race and the next race," Abdi said. "Not really changing anything. Just focusing on improving my race strategy."

For a sophomore who just ran 4:01, that patience might be the most impressive part.

Abdinasir is a member of COROS NextGen, a program which aims to work with elite high school athletes as they push their boundaries to become the next generation of elite distance runners in the U.S. For any high school athlete chasing their best, head to www.coros.com to learn more on products, training tips, and insights from athletes of all levels.