It's one thing to say you want to move fast as a leader, but before you commit to that, it's imperative that you know your race.
Are you running a 100-meter dash or a marathon? You can be fast at each, but fast looks different based upon where the finish line is.
Fast may be a seasonal strategy for you and your team, or it may be the defining characteristic of your company. Regardless, your team needs to know how far they'll be running so they can have the stamina and proper training to last until they win.