Which of the following is included in the 500 hours of required training?

The inclusion of hydrotherapy in the 500 hours of required training for massage therapists is essential because it encompasses important techniques and modalities that directly enhance a client's therapeutic experience. Hydrotherapy utilizes water in various forms—such as hot, cold, steam, or ice—to promote healing, improve circulation, and alleviate pain. Understanding how to effectively use hydrotherapy allows massage therapists to provide comprehensive care and integrate this valuable treatment into their practice.

Other options, while relevant to the overall operation of a massage therapy business, do not fall under the core clinical skills required for a licensed massage therapist. Marketing strategies and financial management, for example, are aspects of running a business, while client follow-up is more related to customer service and client retention rather than therapeutic education or practice itself.