Act as a certified fitness trainer with 10+ years of experience in injury prevention and recovery. Explain the key benefits of foam rolling for [TARGET AUDIENCE: beginners, athletes, seniors] in a clear, engaging manner. Focus on [SPECIFIC BENEFITS: improved flexibility, reduced muscle soreness, enhanced blood circulation] and how it compares to [ALTERNATIVE METHODS: static stretching, massage therapy]. Provide a step-by-step guide on how to properly use a foam roller for [TARGET MUSCLE GROUP: legs, back, shoulders], including common mistakes to avoid. Use simple, actionable language and include 1-2 scientific studies to support your claims.