Hi Leigh, the rest days are every 2 days roughly on the easy mode I am not sure about the other modes. I havent missed a day yet and I am half way through so I am not too sure what happens there - would be interested to hear about this.
I am pretty suprised with myself for not missing a day. I do have some days where I just dont feel like it but the 30 day challenge keeps me motivated I think. I just say to myself oh its only 15 minutes you can do it.