The most valuable hard work often feels risky. Not dangerous, necessarily, but certainly not safe.

Raise your hand in class.
Have the difficult conversation with a friend, customer, or your boss.
Enroll in a course that intimidates you.
Take on the project nobody else wants to do.
Run for the office you might not win.
Suggest an idea that might not work.
Make a cold call.
Introduce yourself.
Try something new.
Admit when you were wrong.
Take responsibility.
Deflect credit.

The best thing about this hard work? It gets easier the more often you do it.