I'm sure that you have heard about the word yoga before, it is  a group of physical, mental, and spiritual practices or disciplines which originated in ancient India.
I have.  It suppossed to be very good for the mind and to relieve stress
Yes. Depending on if you want to follow the practice of  Hinduism, Buddhism, and Jainism each one have their own way with yoga
There is a relatively new trend as well, called Hot Yoga.  It is yoga performed in warm conditions and causes perfuse sweating
well i know that the most popular types are  Hatha yoga and Rāja yoga.
Studies have shown that yoga can be very beneficial mentally and physically for children and young adults.
You are right, origins of yoga have been speculated to date back to pre-Vedic Indian tradition