Studies on this specific calf exercise technique only show it builds muscle in people who are new to working out, and we don't have enough proof yet that it works the same way for experienced lifters, other body parts, or longer training programs.

Our current analysis shows that past-failure partial reps appear to build muscle primarily in people who are new to strength training. This technique involves pushing through a few extra repetitions at the end of a set after you can no longer lift the full weight. Our analysis found 60 studies support this claim, while zero studies refute it [1]. What we have found so far is that research on this specific calf exercise technique focuses on beginners. We do not have enough proof yet to say whether the same approach works for experienced lifters, other muscle groups, or longer training programs. Our analysis of the available research highlights a clear gap in the data. While the technique shows promise for newcomers, we cannot yet extend those results to seasoned athletes or different body parts. The evidence we have reviewed suggests that past-failure partial reps may not deliver the same muscle-building effects once someone has more training experience. We are tracking new studies as they come in, and our understanding will improve over time. For now, the evidence we have reviewed leans toward using this method mainly for beginners. If you are already an experienced lifter or want to target muscles beyond the calves, we recommend sticking with proven training methods until more data becomes available. You can still use past-failure partial reps to push through a tough set, but expect the biggest muscle gains if you are just starting your fitness journey.