That doesn't make sense. At all. You're not improving your form or your endurance by training with beat up legs.
Karate? What the fuck are you talking about? I do two upper and two lower body sessions per week, and box on probably three others. You have comprehension problems or you just like presupposing things?
I am not sure that the same benefits couldn't be garnered by simply squatting and deadlifting and what not. But I don't know.
Go fuck yourself. You know nothing about me or the way I train or the reasons I train for. I have NEVER made any reference to "no sacrifices need be made" nor have I ever said anything of the sort. I'm in the gym five or six days a week, don't tell me about sacrifice.
And if you're going to post, try dumping the text message typing for real English, you know... like an adult would.