Defensively, the concept of "wall of defence" is used, in which shoulders, arms and legs are used to hinder the attacker from successfully executing techniques. Blocking is a critical element in Muay Thai and compounds the level of conditioning a successful practitioner must possess. Low and mid body roundhouse kicks are normally blocked with the upper portion of a raised shin. High body strikes are blocked with the forearm/glove, elbow/shin. Mid section roundhouse kicks can also be caught/trapped,

allowing for a sweep or counter attack to the remaining leg of the opponent. Punches are blocked with an ordinary boxing guard and techniques similar, if not identical, to basic boxing technique. A common means of blocking a punch is using the hand on the same side as the oncoming punch. For example, if an orthodox fighter throws a jab (being the left hand), the defender will make a slight tap to redirect the punch's angle with the right hand. The deflection is always as small and precise as possible to avoid unnecessary energy expenditure and return the hand to the guard as quickly as possible. Hooks are most often blocked with a motion most often described as "combing your hair," raising the elbow forward and effectively shielding the head with the forearm, flexed biceps, and shoulder. More advanced Muay Thai blocks are usually counters, used to damage the opponent to prevent another attack being made.