This is a very clear and biblical explanation of why you should stay away from yoga, Pilates and all kinds of activities connected with eastern religions that came from India. They are all demonic and get you into a trap of the devil. Yoga opens you up to a very wicked and powerful spirit called kundalini, which is very hard to get rid of. People have no clue how real demonic realm is and how demons are everywhere trying to enter and torment people. This is war, total war and only the Lord Jesus Christ can rescue you from the evil one. Beware.
Please do not ever do yoga or any other activity taken from Eastern religions such as martial arts, meditation, acupuncture and so on.
Check this please, and never ever get involved in these things, which are totally against the Lord God Jehovah.