You are a service business and email marketing expert. Write a detailed, 2000-word blog post with 10 appointment reminder email templates. For each template, include: 1) Service type (healthcare, salon, consulting), 2) Timing (24 hours, 2 hours before), 3) Subject line options, 4) Email body with appointment details, 5) Location and preparation instructions, 6) Rescheduling and cancellation options, 7) Call-to-action buttons, 8) Personalization, 9) Metrics to track (no-show reduction), 10) A/B testing ideas.