Immersion in warm/hot water raises body temperature, causing blood vessels to dilate and circulation to improve. Better circulation results in better release of toxins, promoting a healthier immune system. Hydrotherapy also stimulates the release of endorphins, the body’s natural pain blockers. Endorphins are polypeptides that boost the immune system, relieve pain, and reduce stress. Additionally, a soothing soak in a swirling pool of warm water is a great way to unwind and relax at the end of the day.

According to the Arthritis Foundation, “A hot tub provides the warmth, massage and buoyancy needed to both relax and exercise joints and muscles in the convenience of your home.” Water buoyancy greatly reduces the pull of gravity on the body, relieving joints and muscles of constant pressure. Soaking in a spa creates a comforting sensation of weightlessness. In fact, body weight is reduced dramatically by approximately 90% when suspended in water. Additionally, warm water increases circulation to muscles and joints, temporarily relieving them of stiffness and pain, and increasing flexibility. The Arthritis Foundation states, “Doctors often advise soaking in warm water before beginning your daily activities to help relieve the pain. You may find it just as beneficial to use spas…at other times: in the afternoon to help relax muscles and joints after a full day of activities, to loosen muscles before doing exercises, in the evening before bedtime to relax you for a restful sleep.”

The massaging action of water is perhaps the most unique characteristic of the spa. It is the combination of air and water through strategically positioned jets that produces energized streams of rhythmic pressure. When targeted at desired points of the body, jets can provide a thoroughly invigorating massage to relax tight muscles, soothe away soreness, and relieve aches. Hot tub soaking is utilized by many sports and physical therapists as part of a preventive and recuperative regimen. Warm water also enhances blood flow, increasing delivery of oxygen and nourishments to cells, and thus accelerating the body’s natural healing process.

Studies suggest that soaking in a hot tub a couple of hours before bedtime may assist in getting a better, more restful night of sleep. The temperature shift as the body's internal thermostat drops after exiting the spa induces a feeling of sleep. In addition, the relief from the day’s stress, relaxation of muscles, and overall soothing effect of warm water contribute to better, deeper sleep.