This is essential when the gymnast must create a change in angular velocity. Both linear and angular motion must go through change from frame to frame as the base of support is reestablished and the gymnast translates in and out of equilibrium. For example, the gymnast moves out of static equilibrium from frame A to B, continues changing in and out of dynamic equilibrium during the frame B through G sequence, moves to static equilibrium in frame H, translates out of static equilibrium with changes in dynamic equilibrium from frame H to I, and moves back to static equilibrium in frame J. Consequently, there is general maintenance of control from frame B to G as the gymnast moves in and out of equilibrium with a changing base of support. Static equilibrium exists when the line of gravity is within the base of support and there is zero velocity. This indicates the system is at rest.
Dynamic equilibrium can exist as long as there is no fluctuation in the velocity of a moving body.
Being out of equilibrium, however, is often necessary for the gymnast to effectively change a state of motion. Consequently, a gymnast often deals with the continuum existing in most skills and combinations between being in and out of equilibrium. A changing base of support is needed during most gymnastics performance. The base of support provides opportunity to produce an external torque for controlling angular acceleration and an external force for controlling linear acceleration. B. This certainly allows for greater control or stability within equilibrium and an ability to better manipulate direction and velocity.