Oh this is my bread and butter.
So let’s get the big generalizations out of the way first.
Without stepping, kicks with the back leg will hit harder.
Kicks with the front leg will be faster.
Kicks with the back leg have more reach.
Now, I use kicks a lot, and I mean a whole lot, and what I’ve learned is that context and situation matter a whole lot when it ...
I trained this is the Chinese system when I was in my 20's extensively, and less with each decade. I regret the loss of some of the flexibility, so I might work back toward greater, because it's really optimal if someone, for instance, gets your leg. But it's exponentially harder to get my leg than it was when I was in my 20's.
Joints can be a problem—you'...
To preface, static flexibility (the ability to achieve a fixed position at the extremes of a joints ROM and hold it), is not necessarily going to improve mobility (the ability of a joint to move through a full ROM).
It is also not necessarily going to impact your ability to kick to certain heights. As a personal anecdote, I am 5'9", cannot achieve ...