"Cracking the whip" is a common idiomatic expression that refers to exerting strict control or demanding high performance. There are several synonymous phrases that can be used interchangeably with "cracking the whip." For instance, "laying down the law" or "playing hardball" refers to someone taking a firm stand or putting pressure on others to meet their expectations or goals. "Driving the team" or "pushing the envelope" suggests that someone is urging others to work harder or achieve more ambitious results. Ultimately, whether it is "cracking the whip," "laying down the law," or "driving the team," it alludes to someone taking a tough approach to control or motivate action.