What Is The Hardest Swimming Stroke? | Why Butterfly Hurts

Ask ten swimmers which stroke feels hardest and you’ll hear one name a lot: butterfly. Not because it’s flashy, but because it’s unforgiving. When the rhythm slips, the water wins.

This article answers the question in a practical way. You’ll see why butterfly usually takes the “hardest” label, when breaststroke can feel tougher, and how to judge difficulty for your body and goals. You’ll also get simple ways to train the hard parts without turning every session into a grind.

How People Decide Which Stroke Feels Hardest

“Hardest” isn’t one thing. Swimmers use different yardsticks, and that changes the answer.

Energy Cost And Breath Control

Some strokes spike breathing fast. Butterfly often does that within a lap because both arms move together while the legs drive a fast dolphin kick. The workload stacks up quickly.

Timing And Coordination

Freestyle can tolerate small timing errors. Butterfly rarely does. The arms, hips, and kick must hit a steady rhythm or your body sinks and the next pull feels heavy.

Rules And Turn Details

If “hardest” means “easiest to get disqualified,” breaststroke belongs in the conversation. Competitive breaststroke has strict requirements for arm and leg motion, plus specific sequences on starts and turns.

Mobility And Body Fit

Shoulder range, ankle flexibility, hip control, and core strength tilt the playing field. A swimmer with stiff ankles may struggle more with dolphin kick. A swimmer with tight hips may find breaststroke awkward at speed.

Hardest Swimming Stroke For Most Swimmers: Butterfly

For many lap swimmers and plenty of competitive athletes, butterfly is the steepest hill. It asks for power, rhythm, and body line at the same time. Lose one and the other two suffer right away.

Both Arms Recover Together

Freestyle gives a tiny break each time one arm recovers while the other holds water. Butterfly takes that rest away. Both arms swing over together, and that recovery costs energy before you count the pull.

The Kick Runs The Show

Butterfly is often taught as “pull, breathe,” yet the engine is the kick. A good dolphin kick starts from the chest and hips, then sends a wave through the legs. When swimmers kick only from the knees, the body line breaks and speed drops.

Breathing Can Drop The Hips

Many swimmers lift the head to breathe, which pushes the hips down. Then the arms crash into dead water and the next cycle gets tougher. A low breath that keeps the chest moving is a game-changer.

Small Errors Multiply Fast

Butterfly punishes “almost right.” A late kick can make the arms slip. A wide pull can stall the hips. One messy stroke becomes two, and a full length turns into survival.

If you want a stroke-by-stroke breakdown of timing, body position, and recovery cues, U.S. Masters Swimming lays out the mechanics in its butterfly training guide.

Breaststroke: Simple Shape, Strict Rules

Breaststroke can feel smooth at easy speed, then feel stubborn when you try to go fast or swim it legally in meets. The kick demands ankle turn-out and good knee tracking, and the timing between pull, breath, kick, and glide is easy to rush.

Speed Comes From Precision

Breaststroke rewards a narrow line. If the knees swing wide or the feet sweep too far, drag rises and the kick feels weak. Many swimmers also lift the head too long, which drops the hips and kills the glide.

Meet Rules Add Pressure

Competitive rules require symmetry and set actions on starts and turns. World Aquatics defines stroke legality in its Swimming Technical Rules, which is useful reading if you race.

Backstroke And Freestyle: Easier Starts, Harder Refinement

Backstroke and freestyle usually feel easier to begin with, since you can move continuously and breathe without forcing a lift. The challenge arrives when you want speed with calm effort.

Backstroke Often Fails From Line Control

On your back, drifting is the silent speed-killer. A steady body roll, consistent kick, and a clean hand entry keep you tracking straight. If you bounce side to side, you waste energy correcting.

Freestyle Often Fails From Drag

Most “hard freestyle” moments come from resistance. A dropped elbow, a wide kick, or a lifted head slows you down. Clean those up and the same effort carries farther.

Stroke Difficulty At A Glance

This table compresses what swimmers usually feel in each stroke, plus the common reason it falls apart.

Difficulty Factor	Stroke Most Affected	What You Notice In The Pool
High whole-body power demand	Butterfly	Legs and lungs burn fast after a few lengths
Timing sensitivity	Butterfly	One late kick makes the next pull feel stuck
Breathing disrupts body line	Butterfly / Freestyle	Head lift drops hips, pace falls off
Strict symmetry rules	Breaststroke	A smooth stroke can still earn a DQ in meets
Ankle turn-out needs	Breaststroke	Kick feels like it has no grip
Balance while rotating	Backstroke	You drift or clip lane ropes
Efficiency at speed	Freestyle	Speed gains feel expensive
Shoulder mobility tolerance	Backstroke / Butterfly	Entry or recovery feels tight

How To Tell Which Stroke Is Hardest For You

If you’re not racing, the “hardest” stroke is the one that breaks first. You can figure that out in one session.

Run A Clean 4×25 Test

Warm up, then swim 25 meters of each stroke at a steady effort, resting 20–30 seconds between repeats. Watch what fails first:

• If breathing spikes and rhythm falls apart, butterfly is your limiter.
• If the kick has no grip or the timing feels jammed, breaststroke needs work.
• If you drift and lose count, backstroke balance is the issue.
• If you feel fine yet your pace stays slow, freestyle efficiency is the target.

Do Two Quick Mobility Screens

• Ankles: Point your toes. Limited point makes dolphin kick and flutter kick harder.
• Shoulders: Reach one arm overhead with ribs down. Tight range can make recovery and entry feel rough.

Match The Stroke To Your Goal

If you want hard effort in a short time, butterfly often delivers that. If you want steady laps for longer blocks, freestyle and backstroke usually fit better. Scientists often compare activity intensity using MET values collected in the Compendium of Physical Activities.

How To Build A Better Butterfly Without Burning Out

You don’t get better at butterfly by forcing full laps until you’re cooked. You get better by keeping form intact, then adding distance in small steps.

Link Two Kicks To One Arm Cycle

Butterfly gets smoother when the two kicks match the arms:

• Kick 1: As hands enter and you press the chest forward.
• Kick 2: As hands exit and swing over.

Think “press, snap.” The chest press starts the wave. The snap kick finishes the stroke.

Use Short Repeats With Real Rest

Short repeats keep timing clean. Start with half-length butterfly and add a few meters only when the last rep looks like the first.

Fix Breathing With One Rule

Breathe when your hands push past your ribs, not while they’re still out in front. That keeps the head low and the hips near the surface.

Butterfly Progression Sets You Can Reuse

Pick one row and repeat it for several sessions. Move down the table when you can hold form across the whole set.

Goal	Main Set	Form Cue
Learn rhythm	8×12.5 fly, easy rest	Press chest, snap kick
Link breathing	8×25 fly, breathe every 2 strokes	Chin skims, hips stay high
Hold form tired	6×25 fly on a steady send-off	Hands enter shoulder-width
Add speed	12×15m fly fast + easy back	Fast kick, quiet head
Build race skill	6×50 as 25 strong + 25 smooth	Second 25 stays low
Sharpen turns	8×25 fly with one tight turn	Two-hand touch, quick tuck

Simple Fixes For Breaststroke And Backstroke

If butterfly isn’t the stroke that wrecks you, breaststroke and backstroke are common culprits. One clean tweak can change the feel fast.

Breaststroke: Make The Kick Narrower

Many swimmers sweep the feet too wide. Try setting the knees hip-width, turning the feet out, then snapping the heels back together. You should feel the water grab on the inside of the feet.

Breaststroke: Slow The Hands After The Kick

When you rush, you pull while your body is still sliding forward. Count a short “one” after the kick before starting the next pull. That pause lets speed carry you.

Backstroke: Enter Cleaner, Not Bigger

If your hand slaps in, the shoulder often feels it. Aim for fingertips first, then slice in line with the shoulder. A calmer entry can feel easier and still move you well.

Where This Leaves You

For most swimmers, butterfly is the hardest swimming stroke because it demands power, rhythm, and body line at the same time. Breaststroke can feel tougher when ankle turn-out is limited or meet rules matter. Backstroke can feel toughest when balance and shoulder comfort are the limiter. Freestyle is often the easiest to start and the hardest to polish at speed.

If you want one action to take today, choose the stroke that breaks first and train it in short, clean repeats. That’s how hard strokes turn into normal strokes.