This is something I've been meaning to write about for a couple years now, so finally here goes.
The Goal: Complete 40 half-marathons by the time I turn 40.
The Reason: Because doing something once is just a first step. Because Forty-By-Forty has a great ring to it. Because by starting this in my twenties, this means I will have to maintain a level of fitness for more than a decade, hopefully meaning that I will have and continue healthy habits for life. Because doing something forty times can't be just a fluke. Because doing something forty times means making it a priority, and working around life, work, and family.
Write a novel in forty days, try forty new restaurants in the next five years, read forty books... What's your 40x40 challenge and why?