What Is the Hardest Stroke in Swimming?
What if I told you the hardest swimming stroke isn’t always the one you think it is? Most swimmers will shout out Butterfly without hesitation—but is that really true? Let’s dive in and break down the debate once and for all.
Understanding which stroke is the most challenging isn’t just about bragging rights at practice. It affects how you train, how you recover, and even how you structure your race strategy. If you misjudge the difficulty of a stroke, you might waste valuable energy—or worse, plateau in your progress.
Stroke Breakdown: From Hard to “Extremely Hard”
So, what is the hardest stroke in swimming? Let’s put all four competitive strokes under the microscope.
1. Freestyle: The “Deceptively Easy” Stroke
Most beginners start here. Freestyle is the fastest stroke and often feels the most natural. But don’t underestimate it.
Challenges:
- Requires precise breathing patterns (ever swallowed water mid-race?).
- Demands balance between distance per stroke (DPS) and stroke rate (SR).
- Elite swimmers push the limits with underwaters and flip turns.
Still, compared to the other strokes, Freestyle usually feels the least punishing. It’s popular—but not the hardest.
Want to master your freestyle? Check out our 90-Day Freestyle Program.Video:Unlock Freestyle Power
2. Backstroke: The “Silent Killer”
Backstroke looks relaxing—you’re on your back, staring at the ceiling. But here’s the deal: it’s SNEAKY hard.
Challenges:
- Demands constant Body Rotation without visual cues.
- Turns are tricky—nailing the Backstroke Flip Turn is an art (and absolutely worth mastering). If you want a deep dive into elite-level mechanics, check out The Nuts and Bolts of Backstroke Flipturns for Coaches.
- Breathing is unlimited, but alignment is NOT. Lose your line, and you’re adding drag fast.
It’s not usually voted the hardest, but Backstroke takes serious skill.
3. Breaststroke: The “Timing Test”
Ask any coach, and they’ll tell you—Breaststroke separates the technically sharp from the mechanically sloppy.
Challenges:
1. The timing of the kick, pull, and glide has to be exact.
2. It’s the slowest stroke but one of the most taxing on the knees and hips.
3. Even small errors in timing crush efficiency.
In our Deep Dive Series with Coach Markus Marthaler, he explains that while Butterfly is often called the hardest to learn, Breaststroke might actually be the hardest to race. Why? Because of its rhythm:
“Breaststroke has this forward-backward rhythm—almost like two steps forward, one step back. To maintain speed at a high level is extremely hard.”
He also points out that flexibility plays a huge role. Your knee and ankle angles can make or break your kick efficiency. That’s why some swimmers are naturally better at Breaststroke than others.
Watch the breakdown: Deep Dive on Breaststroke with Markus Marthaler
Another deep dive series with @MarkusMarthaler this time on the Breaststroke stroke! Learn why we think Breaststroke is the Hardest Stroke to SWIM WELL!
Key Takeaway from the Video:
- Butterfly = hardest stroke to learn.
- Breaststroke = hardest stroke to swim FAST over time.
And as Markus highlights, breaststroke is also the least “knee-friendly” stroke, which is why many coaches limit it for younger age group swimmers to prevent injury.
Struggling with your Breaststroke? Our 90-Day Breaststroke Program can help refine your timing and efficiency.
4. Butterfly: The “Beast”
Now to the stroke most swimmers love to hate. Butterfly is often called the hardest swim stroke—and for good reason.
Challenges:
- Requires explosive upper-body strength AND massive core stability.
- The dolphin kick is extremely demanding on the lower back and abs.
- Breathing has to be quick and perfectly timed, or you lose momentum.
- Sprinting fly is brutal; swimming it mid-distance or longer? Next level.
Michael Phelps didn’t dominate Butterfly by chance—it took insane conditioning and technical mastery. For most swimmers, fly earns the crown as the hardest stroke in swimming.Want help improving your fly? Explore our Butterfly Stroke Course for Coaches or get a video analysis package for personalized feedback.
The Case for “Hardest Popular Strokes”
While Butterfly usually tops the list, many argue Breaststroke is equally brutal – just in a different way. Fly tests your strength and endurance, while Breaststroke tests your precision and patience.
Both can feel like extremely hard swimming strokes, depending on your body type, training background, and even flexibility.
How to Train for the Hardest Stroke
If you want to survive—and thrive—at the hardest strokes, here’s where to start:
- Build Core Strength
Butterfly and Breaststroke require insane core control. Add dryland planks, med ball twists, and kettlebell carries.
Try our Virtual Dryland Strength Training. - Practice Breathing Drills
Fly demands short, efficient breaths. Backstroke requires head stability. Test hypoxic sets in Freestyle to build capacity. - Master Underwaters
All four strokes require dolphin kicks off the wall. The better your underwater game, the less time you spend grinding in the hardest parts of the stroke.
Record and Review Your Technique
Most swimmers aren’t aware of small mistakes until they see them. That’s where swim video analysis comes in.
Contrast & Debate: Why the Answer Isn’t So Simple
Some coaches argue Butterfly is only the hardest because swimmers train it less. If you swam as much Butterfly as Freestyle, maybe it wouldn’t feel like torture.
Others argue Breaststroke is harder because no other stroke demands such perfect timing. And backstrokers? They’ll tell you nothing feels worse than drifting into the lane line during a race.
Bottom line: the “hardest swim stroke” is personal. It depends on your strengths, weaknesses, and even your mindset in training.
Takeaway
Most swimmers will call Butterfly the hardest stroke—but Breaststroke has a strong case, too. The real challenge? Figuring out which stroke pushes YOU the most, then attacking it head-on.
At your next practice, add 4x50s of your hardest stroke on short rest. Track your times and see how long you can hold technique.
Level Up Your Swimming
Want to stop dreading your hardest stroke? Let’s turn it into your secret weapon.
- Get personalized feedback with our Swim Video Analysis Packages.
- Train smarter with Customized Swim Workouts.
- Or take your stroke mastery further with our 90-Day Technique Programs.
The hardest swimming stroke doesn’t have to stay hard. With the right tools, you can make it one of your best.