Climbing Half Dome.
Self-publishing that book.
Learning how to salsa dance.
Composing that song.
Applying for that job.
Asking that special someone out for something more risky than coffee.
Registering for your first 5K.
Initiating that phone call to reconnect with a long-long friend.
Moving across the country to follow your calling.
Creating the stepping stones to make your dream into an actual business.
What's the one thing that you cannot NOT do?