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As teenagers, Marcus had been the muscle and Jake the brains. Marcus had beat up the kids who'd made fun of skinny Jake; Jake had convinced teachers not to punish him. Since then, Marcus had grown a brain (kind of) and Jake had developed muscles. But habits die hard.

Gena Showalter (2012). “Catch a Mate”, p.238, Harlequin
As teenagers, Marcus had been the muscle and Jake the brains. Marcus had beat up the kids who'd made fun of skinny Jake; Jake had convinced teachers not to punish him. Since then, Marcus had grown a brain (kind of) and