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Why I Decided to Become a Morning Runner — Again

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  Why I Decided to Become a Morning Runner — Again After two years of injuries and excuses, the answer was embarrassingly simple. I just had to wake up earlier. I. The Hunger to Run For the past two years, the pattern was always the same. Train a little, race, get injured, spend months unable to run. Recover just enough, race again, get hurt again. Despite years of running, I was going nowhere. This year, I changed one thing: I stopped chasing times and focused on staying healthy. The results? A full marathon finish. A 100km ultra finish. Both without injury. After every previous race, I'd been limping for weeks or unable to run for months. This time, I could lace up again within days. I didn't realize how extraordinary that was until I experienced it. That difference — between pushing too hard and coming home in one piece — deserved a closer look. Pushing too hard → Injury Finishing healthy → C...
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[Part 21] Why It's Called the AI "Singularity" — Not the AI "Revolution"

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  [Part 21] Why It's Called the AI "Singularity" — Not the AI "Revolution" AI Survival for the 40s & 50s · Series EP21 · Ray Kurzweil — The Singularity Is Nearer ··· In Part 20, I wrote this: "This time, I won't be caught off guard." So I picked up a book. Ray Kurzweil's The Singularity Is Nearer . A man who got 86% of his 147 predictions right. The man who coined the term "singularity," and prophesied it would arrive by 2045. After finishing the book yesterday, I waited for my son to finish studying. When he came out for dinner, I started talking. "Daehyun, I finally finished The Singularity Is Nearer . Want me to tell you about it while you eat?" "Sure." He'd listened with interest when I told him about Yuval Noah Harari's 21 Lessons for the 21st Century before, so I felt comfortable bringing this up too. ··· 1 What Is the Singularity? "To understand wh...
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[Part.10] The AI Age Promises Prosperity. Just Not for Us.

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[EP.10] The AI Age Promises Prosperity. Just Not for Us. Survival Questions for Workers in Their 40s & 50s in the AI Era · Series Episode 10 They call it the Singularity. AI is coming, they say. The Singularity. Another word for revolution. Just like the Industrial Revolution. The AI Revolution is on its way. Famous voices say: "A world where money is no longer necessary is coming." "An era where no one needs to work is coming." Sounds good. I want to believe it too. ··· But then why are we so anxious? Something from history class comes to mind. The age of revolution. What I vaguely remember: Unemployment. Riots. People flooding the streets. Machines arriving. Factories rising. The world changing. And the ones who were shaken the most were always the people living through it. Will the AI age be any different? Let's look at how past revolutions actually unfolded — and what they meant for the people living through them....
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Gwanaksan Trail Running — It Wasn't Training. It Was a Picnic.

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    Gwanaksan Trail Running — It Wasn't Training. It Was a Picnic. I. Course Overview Section 1: Mountain Entry & Ridge (Anyang Sports Complex → Gwacheon) Start: Anyang Sports Complex (Bisan-dong) Behind the stadium → Military base (Subangsa) entrance → Gwanaksan Forest Trail → Bisan Ridge → Toward Gwacheon Maebong Peak This section bypasses the stream and climbs directly onto the Gwanaksan ridge via the trail beside the military base. The uphill starts right away and demands energy, but you're immediately rewarded with dense forest. This is where real trail running begins. Section 2: Descent & Connection (Gwacheon → Sadang) Gwacheon Maebong descent → Near Gwacheon Government Complex Station → Gwacheon Boulevard sidewalk → Namtaeryeong Pass → Sadang Station After descending from the mountain, you cut through downtown Gwacheon and cross into Seoul. Namtaeryeong Pass has a gentle (?) slope before leading yo...
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Recovery Run After a 100km Ultra: Medicine or Poison? I Tested It Myself

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  Recovery Run After a 100km Ultra: Medicine or Poison? I Tested It Myself Two days after finishing a 100km ultra at Cheongnamdae, I laced up again. Here's what happened — and what science says about it. My Body Rejected the First 300 Meters Two days after the Cheongnamdae 100km ultra, I put my running shoes back on. Honestly, even walking wasn't comfortable. The moment my foot hit the ground, my palms went cold with sweat. My entire body was screaming at me. "Not yet." But then something strange happened. Around the 300-meter mark, my body started to loosen up. By the time I hit 1km, I could actually run. I started at an 8:00/km pace, and before I knew it, I'd settled into 6:30/km. I ended up running about 5km total. The real surprise came afterward. Walking felt noticeably easier than before the run. That's when it hit me. "So recovery runs really are a thing." · · · Why Does Running Help You...
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