Before revision: Some movements are specific to CrossFit; for example, in order to perform certain movements such as pull-up faster, "kipping" that relies on the momentum of a swing to move faster may be employed, although its use is considered controversial to non-practitioners of CrossFit.
After revision: for these purposesSome movements are specific to CrossFit; for example, in order to perform certain movements such as pull-up faster, "kipping" that relies on the momentum of a swing to move faster may be employed, although its use is considered controversial to non-practitioners of CrossFit.