People who feel more energized during their workouts tend to perform more total exercise, and this higher exercise volume is linked to larger muscle growth.

We analyzed the available evidence and found that people who feel more energized during their workouts tend to do more total exercise, and this higher volume is connected to greater muscle growth [1]. What we’ve found so far suggests a pattern where perceived energy during training may help drive increased effort, leading to more sets, reps, or weight lifted over time — which in turn is associated with more muscle development. This doesn’t mean feeling energized directly causes muscle growth. Instead, the evidence points to energy levels acting as a signal that helps people push harder or longer during their sessions. Higher training volume — meaning more total work done — is a known factor tied to muscle adaptation, and when people feel more energized, they often naturally do more of it. We did not find any studies that contradict this pattern. The single assertion we reviewed, supported by 46.0 data points, consistently links perceived energy to increased training volume and then to muscle growth. However, we don’t know if the energy itself is the driver, or if other factors — like motivation, sleep, or nutrition — are influencing both how energized someone feels and how much they can do. Our current analysis shows this connection is consistent across the data we’ve reviewed, but we can’t say whether boosting perceived energy — through caffeine, rest, or mindset — will reliably lead to more muscle. More research would be needed to test if changing energy levels directly changes outcomes. For now, if you feel more energized during your workouts, it may help you do more work — and doing more work is often linked to bigger gains. Pay attention to how you feel, and use that as a guide to adjust your effort, not as a rule to follow.