Yay! Nice company! I'm eager to join you. Of course, I've already started a challenge on the 1st of May, but didn't have time to post it yet.
Here it is:
1) Do exercises for my back every other day.
Actually, it's the continuation of my April challenge. I'll stick to it till June 1st as I do these exercises not every day, but once in 2 days. Haven't missed a work out so far!
2) Don't eat for 4 hours before going to bed.
First started it on May 1st, failed the next day and started again on May 3rd.
3) Wake up at 8 every morning.
I'll start it on May 8th or 10th (depends on when my holiday will be over). Anyway, I'll have 21 days to work on this habit.
I have to post the results of my April challenge and I'll do it later.
Good luck to everyone!
P.S. Maybe I get it wrong but I thought a challenge meant exactly a 30-day trial on this forum. For example, I do work outs (not for my back, but for the whole body) 3 times a week this month, but I don't consider it a challenge as I don't have to do it every day.