Acommon visual behavior is the âhead jerk.â This motion is generally observedwhen an individual otter approaches a raft of sea otters. The approaching otternoses and sniffs the other otters while jerking its head from side to side.
Axis tilt is the vertical angle at which the ball rotates. Axis tilt is what is commonly known as spin. Axis tilt is determined by the position of the thumb during the release. If the hand turns too early, the thumb exits on top of the ball. Bowlers with a high degree of axis tilt will be able to see the top of their hand during the release and follow through.
Pelvic tilt is normally calculated as â the angle between the ground and a line drawn between the anterior superior iliac spine and the posterior superior iliac spine of the pelvis â , although it is also calculated as â the angle between the line joining the hip axis and the center of the end plate of the first sacral vertebrae and the reference ...