I have been in the industry for over 25 years. I always make it a point to go back and look at my training manuals now and again. It really refreshes my memory.
I have one book in particular I like in my library. It is clear and simple. It also has a companion cd-rom included. It is more about how the body moves rather than particular exercises.
‘Fitness Professionals Guide to Musculoskeletal Anatomy and Human Movement’, by Lawrence A Golding and Scott M. Golding (father and son).
Good Luck. Let me know if you end up buying it!
I have a suggestions for a series of videos which you can purchase but which the author also has generously made available on YouTube in their entirety. They are called ‘Integral Anatomy Series’ and are by Gil Hedley. This series of a total of 6 hours is footage of human dissection. And while that may sound intimidating, it will give you a view of the human body no anatomy book can provide. Here is a link http://www.youtube.com/playlist?list=PLQRL-lRQdb5iiox5vBd8kfcXumHMYN2XU.
“The Seven Habits of Highly Effective People” by Stephen Covey.
There are tons of trainers who know the body but are unable to move a passion into a business. In addition, you can help a clients physically but it is far more rewarding to help a client completely change their life. This is great book for leaning how to improve people outside and inside.
Best of luck to you!
One of my favorites I get every 5 years or so is the Anatomy Coloring Book. Because I am very visual I find working through that keeps my anatomy fresh.
Even though I am not currently doing personal training I do have a copy of the ACE instructor manual, which I find great to dip into from time to time.
I also think it is useful to keep track of what fitness related books are on the best seller lists. Clients are often interested in quality of life, lifestyle choices such as diet, and mind/body issues, in addition to how to get buff or strong. If your clients come to you for an opinion on some current popular book or idea it is good to have some familiarity with these topics. For example I would recommend reading something by Michael Pollan for issues related to food, health, and sustainability.
There was also a book out recently called ‘Buddah’s Brain’ that gives some great insights and techniques from current research in neuroscience on happiness, mood, anger, meditation, and so on.