) This thread is based on that idea, but is more generic: YOU decide what behavior you want to focus on (you might want to follow WW or some variation, or may just want to commit to a certain amount of exercise -- whatever behavior you would like to make a habit) and commit to that for 21 Days. Then you might continue on for another block of the same, or you may want to add another behavior. The idea is that it tales 21 days to form a new habit. Sometimes it takes a lot of starts before you get through the first block of 21 days 
but if you persevere, you WILL make it. And it gets much easier as you go along, until - YES! - healthy behavior becomes a habit!21 DAY CHALLENGE
1. Your 21 days must be CONSECUTIVE days! That is the whole point in forming new habits.
2. This works on the "honor" system...no one will monitor you...if you "mess-up", you are only cheating yourself by not beginning again! The importance behind this challenge is to have 21 consecutive days of self control!!
3. What do the numbers mean that you see by peoples' names?? They stand for DAY/POUNDS LOST/BLOCK. 1/0/1 is Day 1, 0 pounds lost, Block 1.
4. Once you have finished block #1 (the first 21 days) you will progress to block #2...
5. For each block, you should state your rules and follow them for 21 days... repeat this as many times as necessary until you are at your goal. Your rules may be as specific or vague as you want: for example, I've considered just at the end of each day, asking myself whether my behavior would lead to better health (and weightloss) and counting myself on track if it did. Or you can stipulate as many rules as you'd like - if you want to change your plan, simply start over with a new Day 1.
Good luck to you as you complete your journey!
YOU CAN DO THIS!!! It all starts with a single step... and following with a new one each day!! 
to finish a block of 21 Days yesterday, although my weight loss for the block was a whopping four (4) pounds, due to yoyoing. 
Thanks for posting this new version, Blockette Babette! I'd like to participate in this block party. I've been on what I call The Azure Initiative since Sunday (I name them pretty much from the color of my journals and then make up a fantasy to motivate myself ... it's all a game). My goal is to lose 29.5 pounds from Sunday's weigh-in of 164.5. I used to weigh in the neighborhood of 247 and probably more, got down to the neighborhood of the low '40s but am now drifting up again ... probably because of less exercise since some health problems and a bad fall slowed me down. It IS a health measure for me to lose this weight as I believe I will feel much better, plus my sore knees will thank me.
) and did about 40 minutes worth of Tai Chi. I had nine fruit/veg servings and more than 3L water, ate 30 points and exercised 8. 
