Which component of the AGSM is primarily focused on maintaining muscle readiness?

The component of the Anti-G Strain Maneuver (AGSM) primarily focused on maintaining muscle readiness is indeed muscle tensing. This technique involves actively engaging and tightening muscle groups to counteract the effects of G-forces during high-performance maneuvers. When a pilot experiences increased G-forces, muscle tensing helps maintain blood circulation and prevent blood from pooling in the lower extremities, thereby reducing the risk of G-induced Loss of Consciousness (GLOC).

Muscle tensing contributes to overall physiological readiness by ensuring that the muscles are prepared to react and support the body against the forces experienced during flight, enabling better control and increased endurance under stress. This proactive engagement of muscles complements other elements of the AGSM, which focus on breathing and mindset, but the primary role of muscle tensing is to ensure that the pilot's body is physically prepared to withstand the challenges posed by high G-forces.