transition
A process of linking turns that begins during the finish phase of a turn and continues into the initiation phase. It begins as the rider decreases edge angle in preparation for an upcoming turn and ends as the new edge is engaged. Also the curved part of a halfpipe that connects the flat with the vert; or the judged portion of a halfpipe run between landing on one wall and taking off on the next wall.
traverse
To move across the slope without entering the fall line.
tuck
A crouched posture that minimizes air/ wind resistance; the rider’s back is relatively parallel to the board.
turn
A curved path of descent or change in the direction of travel. Also, the rotational action of the snowboard relative to the surface of the snow, as a result of muscular effort to change the direction the board points.
turn phases
Turns consist of three phases, initiation, control (or shaping), and finish. The initiation phase is marked by the board’s entry into a new turn. In the control phase, the entire edge of the board should be engaged. During the finishing phase, the rider either actively brings the board back under the CM through leg guidance or moves the CM over the board from inside the turn.
turn radius
The size of a turn. The sidecut of a snowboard can influence turn radius. See also sidecut radius.
turn shape
The shape that a snowboard leaves in the snow during a turn, your signature on the snow. Turns might take a variety of shapes, such as C, S, J or Z.
turn size
Broken down into three main categories of short-, medium-, and long-radius, turn size can be affected by many factors, including riding style, terrain, and snow conditions. Each turn size is distinctly different in terms of distance travel, both down and across the hill.
turn type
Snowboard turns can be broken down into two basic types, skidded and carved. The blend of performance concepts determines how the board will react and perform on the snow, creating either a skid or a carve.
tweak
To make a small variation in movement; used primarily for adding style to airs.
twist
The amount of torsional flex present in the snowboard; or to create torsional flex in a snowboard.
unweight
To reduce pressure on part or all of a snowboard.
upper-body rotation
The movement in which the upper body turns first, followed by the legs turning in the same direction.
up unweighting
A quick leg extension producing a momentary pressure reduction when a snowboarder’s center of mass reaches the top of its movement.
USASA
United States of American Amateur Snowboard Association; USASA runs amateur snowboarding competitive events for all ages.
USSA
United States Ski and Snowboard Association; the USSA runs amateur events in six winter sports including snowboarding.
VAK Model
Sensory preferences – visual, auditory, and kinesthetic (VAK) – are the three primary ways people process information.
vantage point
The location from which the instructor views the rider.
vector
A quantity with both magnitude and direction.
wall
The transition and vertical parts of a halfpipe or quarter pipe.
watcher
A type of learner who prefers to learn through clear and meaningful images of specific movements and patterns.
Y model
Graphic representation of snowboarding; developmental model for riders. See also riding model.
Your Responsibility Code A code that sets forth the responsibility of each participant for safe conduct on the slopes and lifts. The code comprises seven points and is a partial list of safe conduct with the message to always be safety conscious.
zones
A means of classifying general ability levels based on appropriate terrain and rider proficiency. While there is no universal system for categorizing snowboarders, this manual refers to beginner/novice, intermediate, and advanced zones.
velocity
A vector measurement of motion describing the rate of change of an object’s position, including both speed and direction.
vert
The vertical portion of any wall or bank. vestibular system
The sensory system that provides the leading contribution about movement and sense of balance.
visual learners
Students who receive and store infor- mation best through visual input such as pictures, images, and demonstrations.
waist
The narrowest part of the snowboard; near the center.
waist width
The width of a snowboard at its narrow- est part, measured in millimeters.
146 AASI SNOWBOARD TECHNICAL MANUAL
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