Prologue: Why Running 100 Times Matters
Running Challenge 100, Mission

1st to 10th runs
Making running a habit
Without a reason, there's no chance of success. · If even 1km is too much? Start by walking. · Why I started running. · A proper warm-up routine is essential before running. · What does it mean to decide to run? · The easiest breathing method for beginner runners. · Misconceptions about three-day resolutions. · How to pace yourself without getting out of breath. · The 5 most common mistakes runners make. · What's the right landing technique for me? · Check out the 1st to 10th runs. · Interview: How to beat myself: Runner Hyungmo Kim

11th to 20th runs
Strengthen your confidence and basic physical strength
People who have the habit of saying, "I have to run someday" · My own way of dealing with injuries · Do you only exercise when running? Resting is also training · 4 stretches that runners must do · The impact of today's 1km on your life · Do this if you want to increase your speed · Running is about creating a 'recovery' system · How to find the right running shoes for you · Why environment is more important than willpower · How to use less effort with the right arm stroke · Check out the 11th to 20th run review · Interview A drama just for me: Runner Kim Hee-bok

21st to 30th runs
Complete 15-minute and 30-minute consecutive runs
If you're at the starting line, you've already done half the work. · How to refocus when you feel tired. · The first 1km of the day creates self-efficacy. · Things to check when you feel heaviness in your ankles. · Running is the practice of keeping promises to yourself. · Tips for runners who have difficulty controlling their pace. · Running changed the rhythm of my life. · The easiest way to make running a habit. · Running and life don't change all at once. · The three most common misconceptions beginner runners make. · Check out the 21st to 30th run. · Interview: Running is the pacemaker of my life: Runner Lee Su-jin

31st to 40th runs
Take on the 3km & 5km running challenge
100 runs that changed my life · Running terms frequently used by runners · You can run a little more if you fool yourself · Downhill running techniques that runners should know · Time to redefine myself · 3 preparation routines to do before running · 'How not to give up' taught me by running · How to overcome days when you really don't want to run? · What comes after a run · Why I run even on rainy days · Check out the 31st to 40th runs · Interview A journey of change that started at 113kg: Runner Park Kyung-sik

41st to 50th runs
Complete 30-minute and 60-minute consecutive runs
Running is the best gift I can give myself · Running is like running alone · The best way to organize your thoughts · Why you should minimize upper body shaking · What I can and cannot control · Does running interfere with a good night's sleep? · Running makes fear disappear · Training methods using heart rate · The perfection of 'imperfection' · Running that maximizes weight loss · Check out the 41st to 50th run · Interview You can run even if you are not visible: Runner Seon Ji-won

51st to 60th runs
Take on the 5km & 10km running challenge
Pain is not eternal · The easiest routine to go from 5km to 10km · The saying that running is like life · Tips for summer running · Running is not a competitive sport · Tips for winter running · Running is proof that you survived today · Morning vs.
When is the best time to run in the evening? _Morning Running · Life becomes simpler when you run · Morning vs.
When is the best time to go for an evening run? _Evening Run · Check out Runs 51-60 · Interview: Reviving Life Through Running: Runner Kang Jae-sik

61st to 70th runs
Complete 45-minute and 90-minute consecutive runs
Running for 'someone', not myself · Tempo runs that teach you immersion · Moments when I fell in love with running without even realizing it · Am I the only one who is too slow? · Common words from people who have completed a marathon · If you want to run well, strengthen these muscles · To you who chose to run today · Why and how to do hill training · Why running is the most powerful way to change your life · Is it true that running is bad for your knees? · Check out the 61st to 70th runs · Interview Running that saved my life: Runner Ki-Hyang Kang

71st to 80th runs
Take on the 8km & 15km running challenge
10 benefits of running you never knew before · When running is hard on your knees · Running makes your body and life lighter · Why rhythm is important in running · To those who say, “I don’t have time to exercise” · Let’s use ground reaction force · What if my past self saw me now? · Why my body swells after running and how to solve it · Unfamiliar scenery encountered while running · Is a cup of coffee before a run a medicine or a poison? · Check out the 71st to 80th run · Interview I just run: Runner Kim Hyun-kyung

81st to 90th runs
Nutrition and conditioning for competition
Planning for 'no plan' · Foods that help runners · How to run the same route differently · Do I really need walking training? · A word to myself in the mirror · Foods I started eating less of after starting running · What does it mean when I get into the running mood? · Why does my posture always fall apart? · Running that reminded me to respect myself again · Running changes with just one way of tying laces · Check out the 81st to 90th run · Interview The reason why I went deeper from a means to a goal: Runner Woohyung Lee

91st to 100th runs
Challenge yourself to a 10km marathon and half marathon
May completing 10km be the beginning, not the end · The importance of bathroom habits · Sometimes, I decide to run just '1km' · Why I need my own running playlist · Daily routine to overcome a slump · How to approach your first race · Running shoes are not just 'sneakers' · Checkpoints on race day! · Erase the records and turn on your senses · Ritual for yourself · Check out the 91st to 100th runs

“By the end of the 100th run,
You are a person who moves and lives every day,
A person who believes in and cherishes himself,
Above all, I will become a person who keeps moving forward without stopping.”

For those of you who want to make a change
A reasonable suggestion from the running mentor of Maranic TV!

As we live, moments like this come.
When you try to keep up with the pace of the world and fall down.
When I feel infinitely smaller than others, I worry, "Is it okay to live like this?" but I'm frustrated and don't know how to change.

The same goes for Jaejin Lee, a runner with 13 years of experience and author of “Running Challenge 100” and the operator of Korea’s top running YouTube channel, “Maranic TV.”
I started running by chance on a day when “just surviving was everything.”
I was frustrated on the first day.
The next day was awkward, but strangely, my heart felt light.
The third and fourth runs continued like that, and before I knew it, they had become my 100th run.
After running about 100 times, I found a reason to believe in myself again.

That's why the author suggests that we just run '100 times'.
Running 100 times is not an easy task, so much so that it would be no exaggeration to call it a 'challenge'.
But on the other hand, it is not a goal that anyone cannot achieve if they put their mind to it.
It's okay to run one day and rest the next, and it's okay to run for only 5 minutes some days.
What's more important than how fast you run or how far you can go is creating a rhythm in life that allows you to move steadily and the strength to persist.

This book was born from the vivid advice and know-how of someone who has personally experienced what happens when you run 100 times.

The joy of steadily accumulating achievements
It is the key to leading tomorrow's change.

There are many reasons not to run—it's a hassle, you're not feeling well, the weather is bad—but once you get going and take the first step, running is the kind of exercise you'll look forward to the next time.
However, for the determination to run to lead to the first step and for one run to continue steadily, you must be able to feel the joy of accomplishment frequently.
The author confidently states that starting 'small' and running 'often' is the key to making running a habit.
《Running Challenge 100》 is a book that contains specific practical methods to make running a habit.

The first 10 days are designed to focus on forming habits, the next 10 days are to build basic physical strength, the next 30 days are to maintain consistency, and the final 50 days are designed to help you achieve your goal challenge.
Under a relatively flexible guide, One Run consists of a journal (100 entries in total) that allows you to review your daily runs and reflect on how you felt at the moment of running, and an essay (100 entries in total) that provides energizing information, including the author's running know-how and tips for running consistently.
So, you can fill in 100 reps step by step while running according to your current level and goals.

The final section of the 10-run series includes a "review" section where runners can look back on their previous runs and interviews with runners who have experienced changes in their running habits.
The section where each new run begins features inspiring quotes from celebrities and a writing section to follow, helping you build your willpower to run again tomorrow.

《Running Challenge 100》 is not a book aimed at simply checking records (if that's what you want, just use an existing exercise app).
Even though I ran hard, I felt refreshed after finishing, and even though I felt listless, I felt alive after running, so I accumulated memories of the moments I ran and was able to meet the changed me in the end.
As the author says, this book teaches “not how to ‘become good at’ running, but how to ‘incorporate running into your life.’”

This book will be a reliable pacemaker for everyone, from beginners who find running a minute difficult, to runners who still find running 10km difficult, to runners preparing for a half marathon, and even for those who want to regain their running habits and grow on their own.
Let's begin a journey to record the changes in my life with this book.

“By the end of the 100th run,
You are a person who moves and lives every day,
A person who believes in and cherishes himself,
And above all, I will become a person who keeps moving forward without stopping.
This book is the starting point of that journey.
Now, let's take the first step.
“100 miracles begin.”
-From the prologue