Hence the central black hole must be exerting a particularly strong gravitational force. That explains why illocutionary force can be deployed without exerting muscular effort. It is considered capable of exerting its modulatory actions simultaneously at multiple targets. Fish swim by exerting force against the surrounding water. A tool for exerting control and power is the use of threats and coercion. Other parties, however, remained firm in their decision to isolate them from exerting influence. With Russia Metternich was more confident of exerting influence. According to Brendan Keogh, these are inherently masculine activities such as fighting and exerting dominance. Nor did he believe that they were exerting themselves to move supplies to his division. WTAR performance also appears to remain stable in patients exerting suboptimal effort. Suppose "homo economicus" thinks about exerting some extra effort to defend the nation. For example, and mostly&colon; exerting countercyclical control.