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Yoga is exercise. It is a form of fitness that promotes strength, flexibility, and stillness. Most yoga classes that I attend are void of religious references. You pose, you hold it, and you release the pose. Many times you're trying so hard just to balance, keep your arms elevated, or stand in a strenuous position for several minutes that you don't have the time or energy to think about anything else. I am persuaded that most Christians who oppose yoga have never even taken a yoga class.
Yoga is also form of meditation. It is a moving meditation. It has a spiritual side, which is probably where most of the controversy about yoga resides. Yoga has a Yoga teacher training India mind-body-spirit connection. Central to yoga is our breathe. When the breathe slows down, the mind slows down as well. In fact, the purpose of yoga was to prepare the body for meditation. When the mind becomes still, we enter into a state of inner peace. When our mind is at peace, we create a greater space for God in our lives, to hear and experience Him on a deeper level, a spiritual level. The Bible says that "the spirit of God is within you." Therefore, it is up to us to prepare our hearts to fellowship with Him. This is why yoga appeals to many Christians.