I’d like to recommend an excellent book about habits: Better than Before by Gretchen Rubin.
It’s a highly readable book chronicling the author’s exploration as to why habits are useful, how to create habits, how we sabotage our efforts, and how the strategies differ for different personality types.
There’s nothing ground-breaking here, but it’s an excellent summary of research you may have read previously, presented all in one place, in an easy-to-read style. You will doubtless pick up a tip or two that you hadn't considered---and wonder how you could have overlooked such a simple technique.
The book's content applies to all habits: cleaning your office, managing your work day, eating, and, of course, exercise.
My only caveat: the author is a no-carbs fanatic. She doesn’t discriminate between simple ("bad") carbs, like cookies and complex ("good") carbs, like fruits, vegetables, and whole grains. So ignore that part and enjoy the rest.
Personal Trainer, Fitness Instructor since 1998.