You must hangout with different people than I do because the extent of my friend's personal experimentation is "I tried Yoga, I feel better. I think I'll keep

You must hangout with different people than I do because the extent of my friend's personal experimentation is "I tried Yoga, I feel better. I think I'll keep going." None of them have ever done testing, cross-over trials, or any attempt at blinding their personal experimentation.