Day Spa: Full-service spas offering hour-long to full-day therapeutic or pampering treatments; accommodations are not provided on-site.

Destination Spa: Dedicated to health and renewal through an all-inclusive program that usually includes spa services, physical fitness, healthy cuisine, and educational programs.

Dosha: In Ayurvedic philosophy, each person is made up of a dosha apha, pitta, or vata ased on the combination of the five elements: space, air, fire, water, and earth. The doshas must be in balance for optimum health.

Eco-Spa: Facilities that limit the use of plastic packaging, bleached paper, and chlorinated, antibacterial wastewater.

Enhanced Water: Water to which vitamins or minerals have been added.

Ericksonian Relaxation Method: Scientifically validated techniques that focus on recognizing and releasing mental and physical tension through mind-body reactive training.

Essential Oil: Distilled, concentrated substances extracted from flowers, roots, leaves, tree resin, and wood containing the therapeutic properties of the plant. See also Aromatherapy.

Facial Rejuvenation Acupuncture: Sometimes referred to as Acupuncture Facelift, the treatment counteracts the effects of aging through the insertion of ultrathin needles into specific areas of the face and body. See also Acupuncture.

Fango: Used in therapeutic massage, this Italian mud relaxes the muscles and alleviates inflammation, arthritis, and rheumatism.

Feng Shui: The ancient Chinese science of promoting well-being through the balance of elements in the environment.

Fitness Testing: The use of sophisticated tools to measure and analyze everything from cardiac risk and bone density to blood chemistry and body composition.

Five Tibetan Rites: This unique yogic system of energizing and balancing exercises invigorates the body chakras, or energy centers, fighting fatigue and slowing the aging process.

Flotation Tank: A body-sized sound and lightproof chamber filled with buoyant, room-temperature water; the state of suspension offers a deep sense of relaxation and peace.

Fluidity: A fusion exercise combining ballet, weight training, and yoga. See Fusion Exercise.

Fusion Exercise: Cross-training classes that blend two or three exercise methods, like yoga, Pilates, and strength training, for a more interesting, invigorating workout.