Strelka/FlickrSo you want to be happier, healthier, and more successful?

You don't necessarily need to resolve to change your life at the New Year — you can do it any time. But faced with unlimited advice and little time to spare, it's hard to know where to start.

The following 21-day self-improvement program is designed for busy people. It features a few habits that will make a big difference if you can get started with them, along with a bunch of tasks that most of us have probably been putting off for too long.

You can start on any Monday and should complete the actions on their specified day when possible. We recommend embarking on this challenge with at least one other person, so you'll have more fun and keep each other in check. 

data commissioner The following slides go through the days and the science behind them in detail.

This is an updated version of a post. Drake Baer contributed to a previous version.

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