All-Stroke Swim Video & Force Analysis

Descrizione

The Biomechanical Perspective: Where Water Meets Force

Water is 800 times denser than air. In swimming, your absolute speed is governed entirely by a single equation: Maximizing Propulsion while Minimizing Hydrodynamic Drag. Traditional swim coaching tells you what your limbs are doing, but it cannot measure how they’re interacting with water forces — and that gap gets wider, not narrower, once you’re off freestyle. This premium diagnostic service is designed and conducted from a strict applied biomechanics and research perspective. We do not look at your stroke through subjective coaching lenses; we analyze it through fluid mechanics, joint angular velocities, and internal sensor-derived acceleration curves.

Why this isn’t one protocol run three times

Backstroke is a supine, roll-driven stroke that hides its catch from every camera angle built for a face-down swimmer. Breaststroke is kick-dominant — the whip kick generates more propulsion than the pull in an efficient stroke, and its biggest efficiency lever, glide time, is nearly invisible to the eye. Butterfly is a timing problem: a simultaneous two-arm pull synchronized against a two-beat dolphin kick and a head-to-hip undulation wave, where a few milliseconds of mistiming shows up as a dead spot no deck-side coach can call. Three different propulsive mechanisms need three different sensor rigs and three different camera setups — this assessment reconfigures for each rather than forcing all three through a freestyle-shaped lens.

Our Three Unfair Advantages

1. Synchronized Kinetics via Vicon Blue Trident IMUs — Placed for Your Stroke, Not a Generic Template. We strap waterproof, ultra-lightweight Vicon Blue Trident IMUs to the skeletal locations that actually matter for your stroke:

– Backstroke: forearm (pull-force and catch timing) + sacrum (body-roll), recalibrated for a supine roll axis, not just relabelled from a freestyle setup.
– Breaststroke: forearm (pull) + shin/ankle (whip-kick force and timing) — because the kick, not the pull, is the primary propulsive phase.
– Butterfly: forearm (pull) + lumbar/torso (the undulation wave itself — a sagittal-plane signal, genuinely different from freestyle’s rotational roll) + ankle (kick-to-pull synchronization).

By syncing this data directly with your underwater video footage, we pinpoint exactly where you’re losing peak acceleration or propulsion, in the specific phase where your stroke actually generates it.

2. Led by an Applied Biomechanist, Not a Coach. A traditional swim coach looks for generic technical templates. An applied biomechanist looks at your structural lever lengths, individual joint mobility, and torque application. Backed by contemporary academic swim research, our specialist provides an objective, data-first deconstruction of your stroke, identifying the anatomical limiters and neurological coordination dead spots specific to what you’re being tested on — ankle dorsiflexion for breaststroke’s kick, thoracic/lumbar mobility for butterfly’s undulation, cervical control for backstroke’s head stability.

3. Camera Angles Built for Where Your Stroke Actually Happens.

What Your Deep-Dive Assessment Includes

– Multi-Angle HD Underwater Video: Angle set matched to your stroke (see table above) — calibrated, high-frame-rate cameras, not a one-size-fits-all rig.
– Synchronized IMU Kinetic Data Map: The force and timing signal that actually matters for your stroke — roll symmetry, kick force, or wave timing, not a generic “acceleration curve” that fits none of them precisely.
– Anatomical Flexibility & Mobility Audit: A dry-land musculoskeletal overview tailored to your stroke’s real limiters — glenohumeral rotation and cervical control (backstroke), ankle dorsiflexion and hip rotation (breaststroke), or thoracic extension and lumbar mobility (butterfly).
– Bespoke Corrective Strategy Report: Target adjustments, land-based mobility drills, and specialized kinetic swim cues, specific to the stroke tested.

Testing more than one stroke: Each additional stroke in the same session adds sensor reconfiguration and a fresh set of camera angles — book Backstroke, Breaststroke or Butterfly as your primary stroke, then add any of the other two as an extra if you want a multi-stroke session (useful for IM swimmers).

Important Session Preparation Rules

– What to Bring: Standard training swimwear, cap, goggles.
– Skin Prep: Avoid moisturizers, body oils, or heavy sunscreen on the day, for sensor adhesion and clean data.
– Fitness Condition: Arrive well-rested. You don’t need to be in peak shape, but be prepared for several 25m–50m steady-state efforts at race pace during filming. Expect longer rest between reps for breaststroke (technically fatiguing per length) and butterfly (the most fatiguing stroke to hold technique in) than for backstroke.