He shifted his bulk a little in the chair.
The snake shifted its bulk slightly, almost as if it were laughing.
Perlmutter shifted his bulk into a more comfortable position before continuing.
Pyros shifted his great bulk into a more comfortable position.
He shook his head, shifting his bulk to look out the window.
Razor was merely shifting his bulk to obtain a more comfortable position.
Big F shifted his bulk along with the direction of the conversation.
He shifted his bulk slightly, as if into a more comfortable position.
He shifted his large bulk in the lawn chair.
Paul shifted his bulk cautiously on the small chair.