The following is a small representation of Legend4D’s vast IP protected words, terms and descriptors that are a part of an overarching proprietary lexicon.

In addition to our wearable’s patent pending status Legend4D’s IP protection entails a large expanse of terminology which is copywritten and or trademarked.

If you desire a copy of Bill’s 73 page paper titled, The Paradigm Problem in Biomechanics: Resolving Baseball’s Arm Injury Crisis please reach out to us.

Acceleration terminology:

Acceleration Dynamics™ The study of how acceleration behaves through time within a living movement system. Acceleration Dynamics describes the sequence, magnitude, and rhythm of accelerating and decelerating forces that define potential for motion health and efficiency. It captures the body’s continuous regulation of acceleration—how it builds, redirects, harmonizes, or disrupts acceleration to achieve coordinated human movement.

Acceleration Behavior™ The measurable expression of how acceleration and rates of acceleration change through time. Unlike torque, which describes static moment magnitude, acceleration behavior quantifies the timing, rhythm, and direction of force application and release. It is the most direct observable unit of mechanical health, distinguishing harmonic (stable) from erratic (disruptive) motion.

Dynamic Tension™ A continuous, adaptive state of controlled muscular force that stabilizes and regulates motion through changing phases of acceleration and deceleration. It integrates eccentric and concentric activity within and across segments to maintain alignment, store potential force, and modulate stability during movement.

Erratic Acceleration™ A disrupted or unstable acceleration pattern that produces abrupt spikes, stalls, or reversals of acceleration. Erratic acceleration indicates mechanical instability, inefficient sequencing, and elevated structural stress. It often precedes tissue overload and ligament injury.

Erratic Acceleration Signature™ 72 The inverse of a harmonic signature, featuring discontinuous acceleration, unstable acceleration transitions, and abrupt acceleration reversals. Erratic signatures correlate strongly with inefficiency and injury potential, particularly at the shoulder and elbow in overhead athletes.

Force Behavior™ A central concept of the acceleration paradigm that describes how force moves in three dimensions, over time, not merely how much exists. Force can be transferred, redirected, leaked, stalled, or harmonized. Force behavior connects the physical, biological, and perceptual domains of motion, bridging cause and consequence.

Harmonic Acceleration™ A smooth, continuous acceleration pattern characterized by rhythmic sequencing and controlled transitions between loading and release. Harmonic acceleration indicates efficient timing, healthy force transfer, and low injury risk. It forms the baseline signature of durable, high-performance movement.

Harmonic Acceleration Signature™ The composite pattern of acceleration and deceleration across a complete movement cycle. A harmonic signature is characterized by smooth initiation, continuous velocity buildup, and controlled braking without disruptive spikes. Each athlete has an individualized harmonic signature that defines their mechanical “fingerprint.”

Harmonic Stability™ The system-level property of maintaining smooth acceleration–deceleration transitions across all movement phases. When harmonic stability is present, force dissipates safely across large muscle groups; when absent, load localizes and tissues fail. It is the defining measure of mechanical health.

Kinetic Stall™ A disruption in the sequential flow of acceleration where force fails to transition smoothly to the next segment. Kinetic stall interrupts harmonic rhythm and often precedes erratic rebound or compensatory overuse. It is an early diagnostic indicator of mechanical inefficiency or instability.