Act as a professional sports coach with 10+ years of experience in athletic performance training. Provide a detailed, step-by-step guide on how to improve reaction speed for [ATHLETES/GAMERS/GENERAL FITNESS ENTHUSIASTS]. Include [SPECIFIC DRILLS OR EXERCISES], [DIETARY RECOMMENDATIONS], and [COGNITIVE TRAINING TECHNIQUES] tailored to the user's level (beginner/intermediate/advanced). Explain the science behind reaction time and how each method contributes to faster neural responses. Use clear, actionable language and emphasize measurable progress over [TIME FRAME: E.G., 4 WEEKS].