Tribal Leadership - 21 Day Challengehttp://www.culturesync.net/21days/
This 21 day daily exercise was painfully exciting and rewarding. It's been a fundamental part of my growth in learning to lead. This description taken from the sign-up page describes it best:
"It's free, but it's not easy. It requires that you watch a short (3 minute) video each day, and take the action that's required. The actions require courage and commitment—two characteristics all leaders share. "
I came out of the challenge with a few really helpful tools including "Click-Down" and "Mountains and Valleys".
An example of a growthful challenge is the "Reputation Challenge" on day 6. It's a simple exercise where you "Find three people whose opinion of you is important and ask 'what is my reputation?'”.
A key value of this exercise is that "Managers Derail Because they are not Managing Reputations".