TURN PHASES
Observe places in the turn where specific body movements and snowboard actions occur. Turn phases provide additional context for describing movements to students. Tese phases are referred to as initiation, control, and finish. Te initiation phase is marked by the board’s entry into a new turn. As the rider shifts their CM over the new edge, the old edge disengages. Ten, as the CM moves over the new edge, the new edge starts to engage. Tis phase is marked by the board having no tilt while decreasing in pressure in relation to the board-to-snow interaction. If a rider actively moves the knees in the opposite direction to generate torsional flex, this produces a visible twisting of the board. Te rider may choose to actively extend the legs to bring the CM over the new edge (known as up unweighting or the most extended
FIGURE 5.7: Turn Phases
INITIATION CONTROL FINISH INITIATION (FOR NEXT TURN)
position at edge change), with simultaneous or independent leg action. Another option would be to bring the board back underneath the CM to release and engage the new edge through a controlled flex of the legs (known as down unweighting). Tis position results from either two unique motions of the lower body, or a blend. A rider arrives at this position by moving the CM in the direction of the board during the finish and initiation of a turn (slower) or by pulling the feet and legs in the direction of the CM with the aid of rebound from the board (Newton’s Tird Law) at the same point in the turn (faster). Te control phase of a turn should engage the entire edge. Although the edge is engaged, tilt may not be the dominant performance concept, depending on the desired outcome – for example, skidding uses less tilt and more pivot while carving incorporates more tilt and pressure. In this phase, the board is guided into and out of the fall line, and is where most steering occurs. It also happens to be the part of the turn in which the rider accelerates. It’s important to continue guiding the board back out of the fall line to manage speed.
In skidded turns, riders keep the CM over the working edge to allow for lower edge angles, thus allowing for greater board pivot. Tey create carved turns by laterally moving the CM farther inside the path of the board (a technique known as “displacement”) and by fine-tuning the edge angle through ankle and knee movements. In carved turns, control is achieved by actively pressuring the board via leg extension or controlled leg flexion. Both types of turns require progressive movements to increase pressure and constant management of pivot and tilt to shape the turn.
80 AASI SNOWBOARD TECHNICAL MANUAL
TheSnowPros.org
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