I used to do these challenges all the time back in 2012/2013. I have sort of fallen back into old ways and I'm so desperate to get back and start losing again. I think this a perfect for me and to start again. I'm going to be really strict on myself and if I fail, it's back to Day 1. No pause days allowed.
My challenge is going to be water intake. I used to be great with this one and now I suck at it.
Challenge: 21 days of drinking 2 litres of water (68oz)
Challenge Started: April 13th 2014
Challenge Finished: ???
Day 1, April 13: