The wheel hub needs to be as friction free as possible, consistent with the hub axle defining the plane of rotation of the wheel. The diagram and photograph below show the cup/cone bearing hub ...

They build strength in the transverse plane (the plane of rotation), which is often neglected in traditional training programs focused on forward-backward or up-down movement such as running and ...

Plane – sagittal, as there is flexion and extension of the knees, elbows, neck and spine. Axis – frontal, as there is rotation around a line running from left to right through the centre of ...