"Just this spot" while pointing to the floor or "You have the whole end line" while gesturing back and forth along the end line.

I can't remember the last time I've had someone move from where they started either legally or illegally.

Even rarer is the OOB pass to another thrower. I've seen it maybe twice.

"You can run."
"Here's your spot."

Another answer may be that the running the baseline is the third or fourth option on the play - so it isn't used very often because they don't get that far most of the time.

I have observed that the privilege of "running the endline" is grossly under-utilized by players. Players are so conditioned to the spot throw-in that they dare not venture to do otherwise for fear of causing a turnover.

Almost the same...
- "You can run" with a side to side hand motion.
- "Spot throw in" just prior to handing the ball to the thrower.

Camera Don't Lie ...
 

What? Do you mean to say that some of our games are videotaped?

"You can run" and "You can't run" are too close for a noisy environment.
You should consider one of the other options mentioned in this thread.

What if you accompany the "you can run" with a visual signal that also indicates the player can indeed run?

I have never had a problem or confusion with saying "Don't move." If a player is too stupid to know what that means, then they have bigger problems. They realize there are only two options. Even if you say "Spot" that does not take away from the kind of crying that goes on for a travel if they move a foot one way or the other.

Peace

Perpetuate A Myth ...
 

I agree that saying "Don't move" might not, and probably, will not, lead to any problems, but why say something that isn't true (it's positively, absolutely, not true), and perpetuates a myth?

"On the spot", accompanied with the visual signal pointing to the floor.

"You can run", accompanied with the visual signal indicating so.

Never had a problem with either and don't think either is coaching or confusing.

"You're on a spot." - with appropriate point to the floor.

"You have the entire endline." - with approprate hand signal.

A few nights ago, the player's response, with a grin, "Thanks. I probably won't need it." (There was no defensive pressure.)

Not everything we say is literal. If that is the case, you should have a problem with anyone saying "running the end line" when no such language is used in the rulebook but very often used to describe the ability to "move" on the end line. I even had a problem years ago with a coach because he felt that it was my obligation to give his player the ball wherever he choose, not where I choose, which resulted in a T on the coach. But that is another story for another day. Never had a problem with saying "Don't move" when I rarely even say that in the first place.

And again, not sure what myth it perpetuates, because people think you travel on a throw-in. It is not assumed it is a travel because a player with the ball moves. It is thought to be a travel because they take steps with their feet. So I am not so sure what myth is perpetuated? They only want to know that they can or cannot run the end line. They do not understand the nuances of the rule to begin with.

Peace

I usually say to a player, "You can run if you need to." And if it is clear there is no press or press coverage of any kind I sometimes add, "You may not need to." Usually gets a laugh or a smile.

Peace

I say the same thing when there is no pressure.