Level 7 Valued Member
Have you incorporated this into your training?
I'm not doing quite everything yet, but whenever I put "Stretching" in my log, it has included the tactical frog series from the book, doing a stage sequence 1,2,3,2,1. That's really about all I can handle - my groin and hips are just wiped out after that, so its the last thing I do. I've always been pretty inflexible, and hip mobility is a definite weak point, so it's not a surprise.
I do think I've seen some improvement already in how deep I can get into the frog - probably beginner's gains. At my last karate practice I felt like I was getting pretty good height on my roundhouse kicks - that might be a direct result, but I think it's a little early to know for sure. I think it's going to be slow going for a while for me - need to keep developing strength in the hips.
All in all, there's some interesting sequences in there - if you've got the space in your training schedule, and you haven't already mastered the splits, I think it's a worthy add. I'm definitely going to stick with it for a while, and see if it translates into more improvement in my kicking.