I also find the phrases half-seat and two point interchangeable, I think they're the same...? I would keep on practicing doing haf-seat when the opportunity arrives, put a basketball in between your upper legs and squeeze(this targets thigh muscles), pretend that your doing half-seat while standing(back arched and everything) and trust me this burns, and lunges to the left, right, front, back. Lunges, lunges, lunges, and more lunges. I have never found an exercise that beats leg strength than lunges. Good luck and have fun!