Create a seamless and efficient check-in and check-out process to minimize wait times and ensure a smooth transition before and after treatments. This can include offering online check-in, mobile payment options, or pre-booking the next appointment during checkout. A streamlined process enhances the client experience by reducing stress and making the visit more enjoyable. Ensuring that the check-in and check-out processes are as hassle-free as possible contributes to a positive overall impression of the spa and encourages repeat visits.