Get a second wind Neutral

Regain energy, strength or motivation after becoming tired, especially while continuing a demanding activity.

The idiom is rooted in the physical experience of exertion. Runners and other people engaged in sustained effort sometimes notice that an early spell of breathlessness or fatigue gives way to a renewed sense of ease. English speakers described this improvement as a «second wind», as though a fresh supply of breath had arrived. The expression became particularly familiar through sporting and outdoor contexts, where breath and stamina are easy to connect. The image is not a precise medical explanation of what happens in the body; fatigue and recovery have several physiological causes. Over time the phrase moved into figurative use for renewed mental focus, enthusiasm or determination during work and other prolonged tasks. The idiom usually suggests a recovery within the same effort, not simply feeling refreshed after a full night’s sleep.

I was exhausted after lunch, but I got a second wind around four.

The runners got a second wind near the finish line.

We nearly gave up, then got a second wind and finished the presentation.