This one is a bit tricky : 

* press <kbd>⌘ Cmd</kbd> + <kbd>⇥ Tab</kbd> to show your running apps. Keep holding <kbd>⌘ Cmd</kbd>.

* press <kbd>⇥ Tab</kbd> until you've selected the app

* press the <kbd>⌥ Option</kbd>, and let go of the <kbd>⌘ Cmd</kbd>. <br />( You must release  <kbd>⌘ Cmd</kbd> after pressing <kbd>⌥ Option</kbd> ! )