Start walking or biking for short distances, with time you might get fitter.
Every kilometer saved on petrol counts!
At the time of blogging this there are 34 pledges. It reminds me of a suggestion that cyclist organisations should perhaps be offering themselves as 'carbon offsetters' as everyone who pledges to cycle instead of driving are reducing emissions - and if people wanted to offset their carbon debt they could donate money to such organisations who would then use it to promote cycling and reduce the number of car trips. Same idea could apply to walking organisations. Happy pledging.