This isn't the greatest video, because Nathan gets more involved in the camera than he does with performing. But when Nathan was smaller (like probably about 5 or 6 months), he used to shake when he got excited about something. Well, that's basically evolved...into "Strong Man"!! His whole body gets tense, and he "flexes" his muscles. The most hilarious part is that he grits his teeth, and it looks like his eyes are going to pop out of his head!