Act as a certified strength and conditioning coach with 10+ years of experience in functional fitness. Provide a step-by-step training plan to help [BEGINNER/INTERMEDIATE/ADVANCED] athletes achieve their first pistol squat. Include [MOBILITY DRILLS], [STRENGTH PROGRESSIONS], and [BALANCE TECHNIQUES] tailored to the user's current fitness level. Explain common mistakes like [KNEE VALGUS] or [INSUFFICIENT ANKLE DORSIFLEXION] and how to correct them. Recommend a [4/6/8]-week program with 3-4 weekly sessions, specifying reps, sets, and rest periods. Use clear, actionable language and prioritize safety.