Chi blocking is utilized by hitting pressure points with quick jabs and punches, and must be done rapidly, often giving little time for the recipient to react. Apparently, even people wearing strong, but not necessarily heavy, armor are not spared from its effects. Any fingers can be used. Additionally, chi blocking cannot work against an opponent wearing specialized armor like that of the Metalbending Police Force.
Chi blocking stops a bender's chi flow, reduces their muscular strength, and disables their bending abilities temporarily; this would be particularly devastating for people who rely solely on their bending to fight. Though non-benders can also have their chi flow blocked, there are some differences in effect. Where as chi blocking would temporarily stop a bender from bending, performing the act upon a non-bender in certain spots results in the loss of movement in that part of their body.