What is one technique that can improve physical performance in addition to adequate sleep?

Arousal control is a technique that can significantly enhance physical performance by managing an athlete's mental state and readiness. This involves techniques such as visualization, relaxation, and breathing exercises that help a performer reach an optimal state of arousal, which is neither too high (leading to anxiety) nor too low (leading to lethargy).

Achieving the right level of arousal allows for better focus, improved decision-making, and increased confidence, which can translate into enhanced physical performance during athletic activities. For example, a well-regulated arousal level can help an athlete maintain composure and execute skills effectively under pressure.

Other strategies like increased caffeine intake or high-intensity training might also contribute to performance, but they don't directly address the psychological aspect of control over one's arousal state. Meanwhile, advanced nutritional supplements may offer physical benefits, yet they lack the important mental tuning that arousal control provides. Thus, mastering arousal control can lead to a more consistent and improved overall performance in physical activities.