Bicep curls? I think not, the secret to true strength is functional movements! Rather than focus on isolation movements, bi-cep curls for instance, CrossFit® focuses on “Functional Movements''. Functional movements recruit multiple muscle groups, which leads to more realistic training and overall, more strength.
Muscle confusion has been shown not only to help overcome fitness boredom but also to provide a mental and physical confusion while preventing complacency or a “routine” way of working out. The muscles and the mind respond to unfamiliar/new workouts by adapting to the environment instead of becoming complacent.