Glide Research — Human movement through water
Every stroke leaves evidence.
Glide Research makes the invisible mechanics of swimming visible — so you can understand what is happening before you try to change it.
Observe·Measure·Understand·Diagnose·Improve
Fig. 01 — Flow separation and hand-path trace, one freestyle cycle
IPremise
Swimming asks a terrestrial body to solve a fluid-dynamics problem while holding its breath.
Its difficulty is not a character flaw or necessarily a fitness deficit. It is the consequence of moving horizontally through a medium the human body did not evolve to navigate.
Fig. 07 — Postural transition: gravity to buoyancy and resistance
IIConstraints
Why swimming feels so hard
Six constraints account for most of it. Each is measurable, and each shows up in the water as something a swimmer can feel.
Complex movement deserves better explanations than tips and tricks.
IIIMethod
Most swimming advice starts too late.
Conventional instruction begins with correction. It attempts to change technique before establishing what is happening, what is causing it, or which change will matter.
Traditional instruction
- Tips
- Drills
- Coaching cues
- Videos
- Trial and error
Change something
Hope it works
Glide Research
01Observe
Record the movement as it actually occurs.
02Measure
Quantify position, timing, velocity and force.
03Understand
Relate the measurements to known mechanics.
04Diagnose
Identify the mechanism producing the result.
05Improve
Change the one variable that matters.
Understanding should come before correction.
IVFramework
The Freestyle Diagnostic Framework
Seven measurable components of freestyle. Each can be observed, quantified and explained. Together they provide a systematic way to understand what the swimmer is doing and why it produces a particular result.
Horizontal alignment of the body line and the frontal area presented to the flow.
- Observable measurement
- Trim angle, degrees from horizontal
- Library category
- Body Position entries
Glide Research Framework — Version 01
VDiagnosis
Symptoms are not causes.
The questions swimmers ask describe what they experience. They do not necessarily identify what is producing it. Effective improvement begins by finding the mechanism behind the symptom.
Diagnostic note
Why do my legs sink?
Observation
Hips and legs trail low; the body feels angled downwards.
Possible variables
Mechanism
Separation between centre of mass and centre of buoyancy creates a rotational torque. Head lift during breathing and incomplete rotation both increase that separation — the legs are usually the symptom, not the source.
Next step
Balance — Why do my legs sink?VIFoundation
Research that explains why.
The first Glide Research framework is built on the biomechanical work of Dr. Jan Prins — decades of laboratory and pool-based investigation into how swimmers generate propulsion, encounter resistance, and coordinate movement through water.
High-speed motion analysis, underwater observation, force measurement, velocity measurement and kinematic modelling form the evidence base.
- Method
- High-speed motion analysis
- Setting
- Laboratory and pool
- Output
- Mechanism, not prescription
Scroll horizontally — research plates, Vol. 01
VIILibrary
Explore the Diagnostic Library
Every entry begins with a question swimmers actually ask and follows the same structure: observation, measurement, mechanism, and what follows from it.
Why do I get tired so quickly?
Why do my legs sink?
Why can't I breathe?
Why am I so slow?
Why does my catch feel weak?
Why do my shoulders hurt?
VIIIDemonstration
One stroke. Several layers of evidence.
The same movement, read four ways at once. Step through the cycle and every view advances together — observation, trace, measurement, interpretation.
D — Diagnostic interpretation
Forearm orients against the flow. Velocity is at its cycle low — this is where lost speed becomes expensive.
Phase 02 — Catch
Learn to see what the water reveals.
Better technique does not begin with another drill. It begins with understanding the relationship between movement, force, resistance, balance and timing.