Motor synergy is a critical mechanism for achieving optimal movement by coordinating elemental variables such as joint angles. This approach enhances both stability and flexibility in movements, allowing individuals to achieve consistent performance outcomes, like reaching a target, while adapting to varying conditions such as fatigue. By focusing on the co-variation of these variables, rather than specifying each individually, it establishes a set of overarching rules, known as coordinated structures, which facilitates effective motor control. This balance of stability and flexibility is essential for adaptable and resilient movement strategies.