Interlimb coupling may be an inherent, albeit ephemeral, tendency of human coordination. By coupling the limbs to perform as a single, functional unit, less “attention” or “neural energy” would be required for the initiation and execution of a complex motor task. However, by reducing the neural drive that is allocated for the initiation of a given task, less would be available for its subsequent execution. Therefore, while interlimb coupling may lead to an optimal solution to the degrees of freedom problem, it may also lead to unwanted decrements in motor performance. Support for this argument has been garnered from studies involving unilateral and bilateral reaction time, movement speed, discrete bimanual reaching tasks, and submaximai isometric exertions. The fundamental purpose of this research was to determine if maximum voluntary muscular force might be similarly influenced by an interlimb coupling mechanism. Results from Experiment 1 suggested that isometric knee extension tasks that were initiated simultaneously were constrained by a mechanism that inhibited the expression of maximum muscular force. Tasks that were initiated asynchronously, however, were not subject to this inhibition and resulted in significantly greater muscular forces. It was suggested that asynchronous task initiation strategies might have facilitated a temporary dissolution of the interlimb coupling mechanism. Experiment 2 attempted to identify the locus of the interlimb coupling mechanism by inducing a functional asymmetry in muscular force, via unilateral submaximai fatigue, and observing the precipitating effects during simultaneous bilateral exertions. Simultaneous bilateral exertions resulted in significantly less force than independent unilateral exertions prior to and immediately following unilateral fatigue. In general, the magnitude of the bilateral deficit of the non-dominant leg was unaffected by dominant leg fatigue. It was concluded that the interlimb coupling mechanism was more strongly related to central mechanisms associated with the perception of bilateral symmetry than to peripheral mechanisms associated with the equilibration of the absolute magnitudes of bilateral force. Results from Experiment 3 revealed that simultaneous two-legged vertical jumping performances were also susceptible to the interlimb coupling mechanism. Two-legged jumps that were initiated from a small step-in were less affected as they facilitated the development of significantly greater force.