Which of the following is NOT a technique for improving G tolerance?

Dehydration can negatively impact G tolerance, making it the correct answer as a technique that does not help improve G tolerance. G tolerance refers to the body's ability to withstand the effects of increased gravitational acceleration, which can occur during high-speed maneuvers in aviation or certain types of physical exertion.

Training is crucial as it prepares the body to handle the stresses of high G forces through conditioning and strength exercises. Hydration is equally important because sufficient fluid levels help maintain cardiovascular function, which is necessary for managing blood flow during G exposure. Acclimatization allows the body to adjust gradually to increasing levels of G, enhancing overall tolerance.

In contrast, dehydration leads to reduced blood volume, impaired physical performance, and can cause symptoms such as dizziness or loss of consciousness under G forces, thereby making it detrimental rather than beneficial for improving G tolerance.