Is yoga for one religion or it is an exercise for all?

Is yoga for Hindu religion or it is an exercise for all?

Answer to this is same as the answer of the following:

  1. Is Karate martial art for Buddhist people or it is exercise for all
  2. Is use of telephone for Christian people or it is a mode of communication for all
  3. Is Arabica coffee beans for Muslim people or it is for all to drink