Generally, when a team is looking to off-load a player, either through restricted free agency or a trade, they "invite" that player to stay away from the facility during offseason training programs.  This is to minimize risk of the player being injured on the team's watch and maintain their trade value.

via www.playerpress.com

In the case of RFA Jared Gaither, a Raven OT who many of us covet, John Harbaugh is requesting / challenging him to attend the team's offseason conditioning program:

I really believe Jared is going to be a premier offensive tackle in this league. The thing we need him to do is to get up there and start working on it.

That's fine - maybe they really want to keep him.  Harbaugh goes on to say:

If he’s with us for the long term, we’ll have a great player. If he’s with somebody else if it turns out that way, he’ll be a great player... There’s no leverage that’s gained by not being with the team working out.

He closes by reinforcing that he wants Gaither to come in, work out, and remain on the team.  But I wonder if he's not trying to accelerate the interest by teams who may remain on the sidelines until the RFA deadline, April 15.