Create a **welcome series** email automation sequence for **new subscribers** in the **fitness** sector. The campaign should achieve **brand introduction and first purchase** with a **friendly and motivational** approach. Generate 5 emails including subject lines, preview text, body content, and CTAs. Each email should be 150-200 words, mobile-optimized, and include personalization tokens. Focus on building trust, providing value, and driving action. Include A/B testing suggestions for subject lines and timing recommendations.