Does the Saitama Workout Actually Work? An Honest Look
In One Punch Man, Saitama credits his power to 100 push-ups, 100 sit-ups, 100 squats and a 10km run every day. Real training won't make you punch through a meteor. But will the routine make you fitter? Yes, in some specific ways, if you approach it sensibly.
The short answer
The Saitama workout is a solid conditioning and endurance challenge. Done consistently, it will improve your cardiovascular fitness, your muscular endurance in the chest, core and legs, and your discipline. It is not an optimal program for building maximum strength or muscle size, and done carelessly (every day, from day one, with no rest) it has real injury risks.
What it does well
- Aerobic fitness. A daily 10km run is a lot of running: roughly 70km a week. Regular physical activity helps prevent and manage heart disease, diabetes and some cancers, according to the World Health Organization.
- Muscular endurance. Hundreds of bodyweight reps a day build the ability to keep going, especially in the chest, triceps, shoulders, abs and quads.
- Consistency. The routine is simple, needs no equipment and fits anywhere. That makes it easier to stick with than many gym programs.
- A clear goal. "100/100/100 + 10km" is easy to remember and easy to measure. Clear goals help people keep training.
There's also some evidence that push-up capacity reflects general fitness. In a 2019 study of active male firefighters, those who could do more than 40 push-ups had a lower rate of later cardiovascular events than those who could do fewer than 10. That's an association in one group, not proof that push-ups prevent heart disease, but it's a nice benchmark along the way.
Where it falls short
- No pulling. Push-ups, sit-ups and squats all push or flex. There is no rowing or pulling movement for your upper back, which can leave your posture and shoulders unbalanced over time.
- Limited strength gains. Once 100 push-ups are easy, doing 100 more of the same stops building strength. Getting stronger needs a harder stimulus over time, not just the same volume.
- Lots of repetitive impact. Running 10km every day, with no easy weeks, is a big load on feet, shins and knees, especially for new runners.
- "Every single day" ignores recovery. Your body adapts to training while you rest. Without rest days, fatigue builds and injury risk rises.
How to make it work in real life
You can keep the spirit of the challenge and fix most of the problems with four changes:
- Build up progressively. Start at your real numbers and increase gradually over 8–32 weeks. The beginner's guide shows what that looks like week by week.
- Take rest days. One full rest day and one lighter day per week keep you training for months instead of weeks.
- Add a pull. Two or three sets of rows (under a sturdy table, or with a band or bar) a few times a week balance all that pushing.
- Progress the exercises, not just the reps. Once 100 regular push-ups are comfortable, try harder variations (decline, diamond, slower tempo) instead of chasing 200.
The Hero Program builds these ideas in. Your plan ramps from your baseline on a gentle-then-steeper curve, and every week has a rest day and an active-recovery day. Rest days never break your streak.
What results to expect
Results depend on your starting point, sleep, diet and consistency, so treat these as rough patterns, not promises (for plan lengths, see realistic timelines):
| Timeframe | What most people notice |
|---|---|
| Weeks 1–3 | Soreness fades, form improves, reps feel smoother |
| Weeks 4–8 | Noticeably higher rep counts; running feels easier at the same pace |
| Weeks 8–16 | Resting heart rate often drops; daily targets feel routine |
| Full plan | The full 100/100/100 + 10km becomes doable on a normal day |
Weight loss is possible, especially from the running, but it depends mostly on what you eat. Saitama also famously lost his hair. There's no evidence that push-ups do that.
Who should be careful
Check with a healthcare professional before starting if you have heart, joint or back problems, are pregnant, are returning from an injury, or haven't exercised in a long time. And stop if something hurts in a sharp or joint-related way. Muscle burn is normal; joint pain isn't.
FAQ
Will the Saitama workout build muscle?
It builds some muscle and a lot of muscular endurance, especially for beginners. For maximum size or strength, you eventually need harder variations or added resistance, not just more reps.
Is doing the Saitama workout every day safe?
Doing the full routine every day from the start is risky, mostly because of the running volume. A gradual build-up with at least one rest day a week is much safer.
How long does the full workout take each day?
For most people, about 1.5–2 hours: roughly 20–30 minutes for the 300 reps split into sets, and 50–75 minutes for a 10km run at an easy pace.
Can I lose weight with the Saitama workout?
Possibly, since the daily running burns a lot of energy. But weight change depends mostly on diet, so the workout alone does not guarantee it.
Sources
- World Health Organization — Physical activity fact sheet
- American College of Sports Medicine (2009). Progression models in resistance training for healthy adults. Medicine & Science in Sports & Exercise, 41(3), 687–708
- Yang J. et al. (2019). Association between push-up exercise capacity and future cardiovascular disease events among active adult men. JAMA Network Open, 2(2), e188341
This guide is general information, not medical advice. Check with a healthcare professional before starting a demanding exercise program, and stop if you feel pain.