The book contains excellent material that used pretty much in every college environment and professional system.
What I find is its readability, straight forward nature and it's progressive. And by progessive I mean you can start with reading the basics of why-how-how much along with an excellent section(s) on what supports all this.
I have this publication and it has summarized a lot of other publications on the subject(s) of conditioning. This book of Steven Ellis - in my opinion, has done a lot of leg work for you and has boiled down in a very simple way .. a very impressive start to your professional inventory of "must have" equipment.
However, a word of caution is in order here. The book has to used honestly and with sincere effort.. routinely. Starting and stoping because of a lack of interst along the way does it and you no justice.