Marc Staal has been "steadily improving" since this summer, but the Rangers defenseman is still suffering from headaches after workouts. Addressing the media for the first time since it was revealed he is battling post-concussion symptoms, Staal, 24, said those headaches can last up to four or five hours. "I feel no symptoms if I don't do anything. If I sit on the couch all day I don't get any headache," Staal said. "If I push myself really hard, later in the day, more often than not, I'll get a headache."