Swimming metrics

Activity: Represents the brush stroke (see Brush stroke metric) normalized by the time taken to perform the two strokes.
Asymmetry: Evaluates how balanced the swim posture is per stroke by reporting on whether the animal bends more toward one side or the other.
Attenuation: Measures how well the depth of a wave is maintained as it propagates along the body.
Body wave number: Refers to the number of waves transiting through the animal's body at a point in time. This metric provides an estimate of the "waviness" of the body posture.
Brush stroke: Refers to the area "painted" by the animal's body in a single complete stroke.
Dynamic amplitude (stretch): Calculates the maximum curvature differences between the two most extreme curvature points at any part of an animal during a given stroke. This metric provides an estimate of the type of body bend (deep or flat) and of the intensity of the "stretching" effort in a stroke.
Reverse swim: Measures the amount of time (%) spent by the animal swimming in reverse, initiating a body wave from the tail that propagates toward the head.
Self-contact distance (curling): Measures the relative amount of time (%) that an animal spends bent around so much that it overlaps with itself.
Swimming speed: Refers to the traveling swimming speed of an animal measured over a two-stroke interval.
Wave initiation rate: Refers to the number of body waves initiated from either the head or the tail per minute.

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