anatomy
The science of bodily structure. angular momentum
The rotational analog of linear momen- tum; defined as the product of an object’s rotational inertia and its angular velocity around a particular axis. The direction a rider goes if the snowboard suddenly breaks loose is the result of angular momentum.
angulation
Laterally tipping the body relative to the slope by creating angles between various body parts. It allows a snow- boarder to adjust edge angle and maintain balance.
ankle strap
A strap on the boot and/or binding that wraps around the ankle to provide heel retention.
anterior cruciate ligament (ACL) The knee ligament that connects the femur (thigh bone) with the tibia (shin bone) and prevents the forward move- ment of the tibia on the femur. The posterior cruciate ligament prevents backward movements of the tibia on the femur.
anterior pelvic tilt
An anatomical condition in which the front of the pelvis slopes downward and the back of the pelvis slopes upward. This condition is more common with women, but affects men as well.
apex
The highest point a rider can attain based on speed, line, and trajectory, either in the pipe or off a jump; or the farthest point of a turn, approximately midway through the arc, in which the snowboard points straight down the fall line. Also used to indicate peak forces in a turn.
approach
The in-run and line to a feature; the movements and tactics a skier or snowboarder uses before reaching the takeoff zone of a feature; areas in the park and pipe designed for setting speed and preparing to use a feature; not a good place to stand. Also indicates moving toward a feature. In relation to PSIA-AASI’s ATML Model, approach represents the first word of the acronym that refers to the sequence of approach, takeoff, maneuver, and landing a skier or rider performs in a freestyle setting.
arc
The curved path of the snowboard during a turn. Also the flight path off a jump, which, ideally, aligns the snow- board to land flat on the pitch of the landing zone.
assess
To collect important clues and evaluate student characteristics, such as emo- tional makeup, expectations, sensory and learning preferences, physical ability, and snowsports experience. These clues indicate how the student may receive information and respond to learning.
assessment
The process of evaluating student char- acteristics to determine how to structure individualized, effective lessons.
asymmetrical
A type of deck in which the toeside flex pattern, sidecut, and/or core is shifted toward the nose.
athletic stance
A body position in which the rider is in balance without excessive leaning (later- ally, fore, or aft) and is aligned over the feet Defined by the ability of the person to move in any direction at any time.
ATMLTM
A freestyle teaching model developed by PSIA-AASI, in which four phases – the approach, takeoff, maneuver, and landing – are observed to evaluate performance on any terrain feature. ATML Model or ATML Method refers to a movement analysis tool based on ATML.
balance
A state of equilibrium that provides both a source for and an outcome of effective movement; when the snowboarder’s center of mass and base of support are aligned to counteract the forces generated from the snow.
balancing movements Muscular actions to maintain equilib- rium, or the desired alignment on skis or a snowboard. These movements are usually divided into two categories: (1) actions that affect fore and aft balance and (2) actions that affect lateral balance.
auditory learners
Students who process information verbally and cognitively. These students enjoy descriptions and talking about their experiences.
autonomy
The third element of the SCARF model, which offers guidance for assessing a student’s unconscious motivation. The acronym stands for status, certainty, autonomy, relatedness, and fairness.
axis
A line about which something rotates; a reference line for human movement.
backcountry
Areas outside area boundaries; see also off-piste and sidecountry.
backside
A direction of initial spin or turn in which a rider’s back is toward the direction of travel; the pipe wall that requires a snowboarder to turn while facing down in the pipe; or when a snowboarder approaches the rail on the heelside, with the line of the rail behind; i.e., the rider is mounting the rail while flying backward.
bail
A metal wire used to hold the toe or heel of a hard boot to a plate binding; to give up on a maneuver or task, as in “bail out.”
132 AASI SNOWBOARD TECHNICAL MANUAL
TheSnowPros.org
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