Guests at the JW Marriott Ihilani Resort & Spa at Ko Olina, Hawaii, can earn points when taking a Fin to Fitness session with a mermaid. Mermaid Kariel conducts the hour-long fitness session at the Ihilani Spa pool, focusing on core muscles while minimizing the stress on the joints. Kariel has an ornate costume that features a hand-sewn sequin mermaid fin. The session is offered Saturdays only from 11am and is open to both women and men who are at least 16 years old. The class fee is $25 per person for hotel guests and you can earn Marriott Rewards points if you charge the session to your hotel folio. Participants will also receive a 15 percent discount on a spa service. Visit http://www.ihilanispa.com to see the spa menu.