I love the idea behind bolder.is.
Not only is it all about getting people to Do Something Different (a technique we use all the time in our behaviour change work). It's also about people issuing challenges to others and giving something in return.
So this lovely lady, Lily, will donate $1 to Meals on Wheels for every person who takes the 'Save for Retirement Challenge'.
Her message is straightforward and applies to us in the UK as well as those Americans:
"Start saving now and it'll add up pretty fast (compound interest is a miracle!). Nearly half of today's Americans are at risk for being unable to maintain their current standard of living in retirement. Saving now - even a little bit - makes a difference"
Why not take her up on it - or issue a challenge of your own?