Kicks are commonly directed against helpless or downed targets, while for more general self-defense applications, the consensus is that simple kicks aimed at vulnerable targets below the chest may be highly efficient, but should be executed with a degree of care. Self-defense experts, such as author and teacher Marc Macyoung, claim that kicks should be aimed no higher than the waist/stomach. Thus, the fighter should not compromise their balance while delivering a kick and retract the leg properly to avoid grappling. It is often recommended to build and drill simple combinations that involve attacking different levels of an opponent. A common example would be distracting an opponent's focus via a fake jab, following up with a powerful attack at the opponent's legs and punching.