In the past few years, I have stopped taking on extra things, like committee work, projects, etc. Now I know teaching is a little different, but once you set the expectation that you are the one that does everything better and "more," it is hard to scale back. Thankfully, I can manage getting up early and I get to work at 6:40, when I really don't need to be there until 7:30. I get most of my work done then (planning, etc) as well as during my regularly scheduled planning period. I think that people know that once the weather turns nicer, I am out of here by 3. I tend to stay later one day a week. I grade papers at home, after my ride or other exercise.
But, I admit to cancelling other types of obligations such as dental appointments because the weather was nice!
But, this is one of the reasons I am resigning/retiring in June. I am ready for some fun. I never thought I would want to stop working at age 53; I have always been a type A workaholic.
By the way, my husband is a boss like Mr. Silver. He sets the tone by prominantly displaying his bike in his office and going on lunch rides, or riding to work. His boss runs at lunch. The whole company works on the premise that happy employees (and fit ones) are productive employees.