Finally, a sub-4 marathon

Jan 6, 2025 · 2 min read

I have been dreaming of a sub-4 hour marathon for quite some time.

Sub-4 may not sound hard for many marathon runners as many aim for sub-3.

But it is a good enough goal for me.

Marathons are very interesting endeavors. Many people have run a 5K or maybe a 10K. One might think that a marathon is just eight and a half 5Ks or four 10Ks stacked up together, one after another.

No, no, no. That couldn’t be further from the truth.

A marathon requires you to pace yourself within your limit for the first 20 miles (but still as fast as possible), then push yourself and grind for the last 6 miles. This is how I feel this time.

I cramped around the 21-mile mark, around three hours into the race, which was hot, humid, and exposed to unshaded direct sunlight. I was on target for a sub-4 marathon, which would be 30 minutes faster than my previous best record. At that moment, I could have decided to give up and start to walk, as many others on the course did. That’s probably what I would have done in the past. After all, if there seems to be no hope of achieving my goal, why bother?

But wait, why do I doubt myself? Have I already given all I have? If not, how can I be sure I will not achieve my sub-4 goal?

I just kept going. I was slower than before but tried to keep a steady pace. The last 50 minutes were more torturing than the first 3 hours combined.

I did it! 3 hours and 56 minutes!

Lesson learned: Never give up until you have given your all!

Shibo Chen
Authors
PhD Candidate
My research interests include heterogeneous computation, datacenter architecture and agile hardware design. My advisor is Prof. Todd Austin. I am a student in ADA (The Center for Applications Driving Architectures) and CELAB (Computer Engineering Lab) at University of Michigan.