If you're already fit, doing certain types of upper-body weight training for 8 weeks—focusing on the part of the move where your muscles are stretched—can boost your endurance just as well whether you test it through a full or shorter motion. This suggests the gains carry over no matter how far you move during the test.

What we've found so far suggests that 8 weeks of lengthened partial-range resistance training may improve lat pulldown endurance similarly, whether tested through a full or partial range of motion, in individuals who are already trained [1]. Our analysis of the available research shows this effect is supported by the single assertion we reviewed, with no conflicting evidence. Based on what we've reviewed so far, trained individuals who perform resistance training that emphasizes the lengthened phase of the movement—where the muscle is under tension while stretched—appear to gain endurance benefits that transfer across different ranges of motion [1]. This means that even if the training focuses on a shorter portion of the movement, the improvements in endurance can still show up when tested over a full motion. The evidence we've reviewed leans toward the idea that these gains are not limited to the specific range trained, at least for the lat pulldown exercise. We only analyzed one assertion, and it reports a supportive finding with no studies or claims that contradict it [1]. However, because the total evidence base we’ve reviewed is very small, we can’t say how strong or consistent this pattern might be across more studies or different groups of people. Our current analysis doesn’t rule out the possibility that other factors—like training history, technique, or how endurance is measured—could influence the outcome. As we gather more data, our understanding may change. Practical takeaway: If you're already fit, focusing your upper-body training on the stretched part of a movement might still help you build endurance that works across full and partial motions—but we need more evidence to be confident in how widely this applies.