Yoga was created as a spiritual practice thousand years ago. Today most people from occident do yoga as exercise and to relieve stress.
The beach is a regular place to practise yoga
There are many types of yoga and the go from mild to intense, some of them are:
Ashtanga or "Power yoga": Offers a demanding exercise and you change postures very quickly.
Bikram or "hot yoga": A serie of 26 postures in a room at 35°C - 37°C and the main goal is to stretch muscles, tendons and purify your body through by sweating.
Hatha yoga: Occasionaly is used for general yoga, it includes breathing and posture.
Integral: Mild type of yoga which includes chants and meditation.
Iyengar: In here body alignment is important and may require keeping postures for long periods of time. .
Kundalini: Emphasizes the effects of breathing over posture. The main goal is to release energy from your lower parts of the body so they can flow up.
Viniyoga: This style adapts its postures to peoples' needs and abilities while coordinates breathing and postures.
Here's an amazing thing, learning a new language while doing yoga