Rules
1. No Complaining
This golden rule to this challenge and is the most important one. Do not complain once, of course it wouldn't be a challenge if this was going to be easy so I expect people to break this one including myself (not on purpose)! If you aren't strict with yourself the only person you will be cheating is yourself and won't gain anything from the experience - so try your very best not to complain eve if it means stopping yourself mid-sentence to avoid doing so.
2. 21 Days
You must keep this challenge up for 21 days, only doing it for 1-2 days won't pose the same challenge or have as big an impact upon the way you think and speak as 21 days will. Take note of the day you start (e.g. marking it on a calendar) and make note of when you finish.
Optional Rules
These are rules that you can either allow yourself to be bound to or not, they are fully optional and depends solely on the individual, you can include as many or as little as you want.
Instead of coping with this challenge for 21 day you can increase the amount of days to make it harder for you or to allow yourself more time to get into this good habit. A good step up I recommend would be to go to 35 days. This is a little over a month and it takes on average a habit 20 - 30 days to become cemented into ones life if practiced every day, so 35 (5 weeks) is perfect for making sure.
2. Bracelet
Will Brown is normally quoted as the originator of this technique and is a very simple and surprisingly effective one at that. The idea is to wear a bracelet and when you complain, take it off and place it around your other wrist and start again from day 0.
I've often heard of this technique when people are trying to break a habit, and that is to place an elastic band (or bands) around your wrist and each time you indulge yourself in this bad habit you in turn pull back and release the elastic band so that it snaps against your wrist. The idea of this isn't to cause yourself pain for the sake of it but that you come to associate this bad habit to the uncomfortable pinging of the elastic band(s).
4. Replace a negative with a positive
If you notice that you are about to complain or are on the verge of complaining then turn it into a positive and say it aloud. For example: "the weather is horrible" could become "we need the rain" etc.