The ideas and training was really helpful, a good tool for training at home when you have no partner to train with.

I agree, solo practice is very important. If you have no clue what you could practice alone, are training karate / tkd / krav maga, and fairly novice, there might be some good drills for you.

If you train something "softer", or martial arts that emphasize body unity (Chinese MA, Judo, Aikido, systema etc), this is probably not your book.

A problem whith this book is that it has plenty of drills, but the detailed instructions on the techniques are lacking. This is OK if you assume the reader has trained longer, or atleast gets the details from their own teacher. But if you've trained longer, i doubt you'll get much new info from this book. And if you've trained less, IMO you need more detailed info. If you need to ask the details from your teacher, you'd be better off asking the drills from your teacher too.

Atleast one good option is "Attack proof" by Perkins / Ridenhour / Kovalsky. It's more a self-defence book, but had drills i found actually useful and new to me.

This is a very good book. Don't look into it though if your a black belt or higher, won't offer too much. This book offers great basic intruction, although it does detail on form, I'd listen to my instructor over this book. It comes from a karate point of view, but the drill are good for all martial art forms. No, there's no great training secrets or anything like that in this book. Any book or person that claims to know a secret of training is lying anyway. These bread and butter (basic) moves and drills will help you become faster and stronger when practiced regualrly. I increased my kicked height and speed, as well as my punching power and speed by using this book.

I've always been a big fan of Loren Christensen's books, but this one is well beyond any martial arts book I've ever read. It's full of ideas that will make you say "Why didn't I think of that?" I've been a martial arts instructor for many years, and I've often been commended for originality, but even I have learned countless techniques and approaches from this book. Well worth the money!!!