First of all, if we imagine to test whether our lungs are healthy in our daily life, then we can choose to hold our breath, because holding our breath is our normal physiological feature, and at the same time, when we humans hold our breath, we can also deal with some short-term emergencies. However, it is also a very simple way to test vital capacity and lung health, and holding your breath for a short time is not only harmless to our health. Moreover, it can prevent us from breathing harmful air in a short time. If we want to hold our breath to test the health of our lungs, we can cover our mouths and see how long it can last. If we hold our breath for 30 seconds in our daily life, it means that our lung function is quite good, but if we can't save it for 20 seconds, it is very likely that there are some problems in our lungs, and we often need to be timely at this time.
Secondly, we can also choose to climb stairs in our daily life to test our lung health. This is because climbing stairs is a very exhausting aerobic activity for us, and this aerobic activity can also test whether our lung function is normal. When we quickly climb the stairs in our daily life and our bodies don't feel particularly tired, then our vital capacity is relatively normal. But if we climb 3~4 floors in one breath, we will be out of breath, which probably indicates that there are some problems with our lung function. Often at this time, we must exercise more, so as to ensure that our lungs are in a healthy state.
Of course, we can also blow out candles in our daily life. It is easy for us to blow out the candles. We can simply test whether our lungs are in a normal state by counting how many candles are blown out in the end, so it can be said that blowing out candles is one of the easiest ways to measure vital capacity and lung health.