What is a benefit of using single-joint exercises?

Single-joint exercises are designed to isolate and target specific muscle groups, making them particularly effective for muscle development in particular areas. This isolation allows for a focused strengthening effect on muscles like the biceps during a curl or the quadriceps in a leg extension. By concentrating on a single joint and the associated muscle group, these exercises can refine muscle definition and strength in targeted areas that may not be optimally engaged during multi-joint or compound movements. This specificity can be crucial for rehabilitation purposes, bodybuilding, or enhancing muscle imbalances.

In contrast, the other options relate to different training goals or methods. Improving cardiovascular endurance typically involves aerobic activities instead of isolated muscle training. Enhancing core stability usually requires engaging multiple muscle groups through functional or compound movements, rather than isolated single-joint action. Similarly, increasing functional strength often relies on compound exercises that mimic real-life movements, making the isolated approach less effective in this context.