His frame is a tall one, but light, and even in perfect health he's got a runner's build. What weight he does have right now is mostly lean muscle. His legs are tense, as is pretty much everything below his waist, but he's trembling still.
"I don't... oh god..." He pants, eyes a little wild, then bends his head until his forehead rests against her collarbone. It's not an especially sensual gesture, but still an intimate one. He needs a moment to think clearly, and the combination of arousal and the goofy antics of Will Ferrel in the background aren't making that easy.