A new fitness trend has sparked concerns among health experts after a viral exercise routine involving sharp, stabbing motions with knives gained popularity online. While proponents claim it improves core strength and flexibility, critics warn of serious risks, including accidental injuries and improper technique. The routine, which mimics thrusting movements, has raised questions about safety and whether it should be attempted without professional supervision. Fitness professionals urge caution, emphasizing the importance of proper form and controlled movements to avoid harm.