Making space for slack.
Being a professional doesn't mean being efficient, trying to make the most out of every hour of the day, every day of the week, every week of the year. Rather, these are sure shot signs of being an amateur.
Instead, a professional focussed on what needs to be shipped and knows that working all the time is a way to avoid the real work, the hard work.
Slack is going to show up in your day one way or the other. If you design it in your system, you can play with it.
When we make space for slack, creativity and effectiveness start showing up too.