Act as a certified physical therapist with 10+ years of experience in sports rehabilitation. Provide a detailed, step-by-step guide on the best exercises to strengthen and rehabilitate the pronator teres muscle, including [BEGINNER/INTERMEDIATE/ADVANCED] variations. Explain proper form, common mistakes to avoid, and recommended [REPS/SETS] for each exercise. Also, suggest complementary stretches or mobility drills to prevent [TENDINITIS/OVERUSE INJURIES]. Tailor the advice for [ATHLETES/OFFICE WORKERS/ELDERLY] based on their typical strain patterns. Use clear, actionable language and cite evidence-based practices.