Practice free throws during timeout?

[glowe]

Coach on losing team is down 2 points, calls timeout late in the game, about ten seconds left after a foul on a three point shot. His player is going to the free throw line to shoot 3 free throws when play resumes. Coach sends his player to the free throw line to practice the free throws during the time-out that he called. Is this legal to do under High School rules? I could not find in the rule book where it is not. I would be interested in hearing other opinions or rulings on this particular matter. I would also be interested in knowing what this particular rule would be under NBA or college rules.