Backstroke Technique: How to Swim on Your Back Efficiently
Good backstroke technique means a flat body line with hips at the surface, continuous shoulder rotation, and a bent-arm pull that presses water straight back toward your feet. Formfix checks all of this from a single iPhone video and returns a 0–100 score with the #1 thing to fix in under 15 seconds.
Backstroke looks relaxed but has its own traps — sinking hips and a straight-arm pull are the big ones. This page covers what good technique looks like, the mistakes that slow you down, and how to film your stroke for analysis.
Download Formfix on the App StoreWhat good swimming backstroke form looks like
Flat, high body line
Hips at the surface, head neutral with ears in the water, eyes looking up — not forward at your toes.
Continuous rotation
Shoulders and hips rotate together around your spine with each stroke — one shoulder dips as the other recovers.
Pinky-first entry
The hand enters in line with the shoulder, pinky first, with a straight but relaxed arm — not crossing over your head.
Bent-arm catch
Underwater the elbow bends so the forearm and palm face your feet — anchoring to press water back, not down.
Steady flutter kick
A compact kick from the hips with relaxed ankles, knees just breaking the surface — no big knee bend.
Thumb-out exit
The hand exits past the hip thumb-first, ready to rotate into the next recovery.
Most common mistakes and how to fix them
Sitting in the water
Why it happens: Hips dropping below the surface — usually from lifting the head or looking at your toes — creates massive drag.
Fix it: Cue 'head back, hips up.' Look straight up, press the back of your head into the water, and keep the kick steady and compact.
Straight-arm windmill pull
Why it happens: Pulling with a straight arm pushes water down instead of back — lots of splash, little speed.
Fix it: Cue 'bend the elbow, push to your feet.' Single-arm backstroke drills build the bent-arm catch; you should feel pressure on your forearm.
Crossing over the head
Why it happens: The hand entering across the midline makes you snake and strains the shoulder.
Fix it: Cue 'enter in line with your shoulder.' Film from behind or above — each hand should enter at 11 and 1 o'clock, not at 12.
Flat, no rotation
Why it happens: Swimming flat on your back without rotating shortens the pull and overloads the shoulder.
Fix it: Cue 'rotate to breathe, rotate to pull.' Kick on your side drills (6 kicks, switch) build the rotation habit.
Bicycle kick
Why it happens: Big knee bend with the thighs pumping creates drag and drops the hips.
Fix it: Cue 'kick from the hips, knees stay under.' Vertical kicking on your back in the deep end rebuilds the pattern fast.
How to film it for analysis
Camera angle
Side-on at the waterline from poolside shows body line and kick. From directly above or behind the head shows hand entry and crossover. Underwater side-on (waterproof case) shows the catch.
Distance
10–15 feet (3–4.5 m) along the lane from poolside; underwater, 3–6 feet (1–2 m) from the swimmer's line.
Framing
Keep the phone still and film a full lap. Backstroke form issues like crossover and hip drop only show clearly across several stroke cycles.
FAQ
What is correct backstroke technique?
Flat body line with hips at the surface, head back with ears in the water, shoulders rotating with each stroke, pinky-first entry in line with the shoulder, a bent-arm pull pressing water toward your feet, and a compact hip-driven kick.
Why do my hips sink in backstroke?
Usually because you're looking toward your toes, which lifts the head and drops the hips. Look straight up, press your head back into the water, and keep the kick steady — the body line fixes itself from the head down.
Should backstroke arms be straight or bent?
Straight (but relaxed) on the recovery and entry, then bending underwater for the catch — the bent forearm faces your feet and presses water back. A straight-arm pull pushes water down, not back.
How do I swim backstroke straight?
Pick a ceiling line or lane rope as a reference, keep your entries at 11 and 1 o'clock (not crossing over), and keep your kick even. Crossing the midline with your hands is the most common cause of snaking.
How do I film my backstroke for a form check?
Side-on at the waterline from poolside, or underwater with a waterproof case, filming a full lap. Upload to Formfix for a 0–100 score and the #1 fix in under 15 seconds.
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