And your rest periods, if you have any, they belong to you too. Your phone doesn't complain if you're thinking about training while you're playing with it, and the weights don't care if you're distracted or not. In the end it's all for you. Some workouts are going to be focused and targeted, and sometimes it's just fun to mess around. If you're going to train, experience it all.
I doubt it's my best blog post, but I wrote it during rest periods. Yay for efficiency!