Interesting. I wonder if it has some kind of detox effect for some people? Anyway, hope you feel better. Sorry to see you go!It seems that inversion makes me sick. This is the second time I've tried it and it seems like I'm developing a cold again (I developed one last month that had me out for almost two weeks, and this is the only common denominator as I generally do not get sick). I'm not completely sure and I have no idea why, but I don't want to risk continuing so I'll be leaving this challenge now.