Adherence

Higher levels of leisure-time physical activity are consistently and positively associated with higher cardiorespiratory fitness (CRF) in adults.

To improve your cardiorespiratory fitness, prioritize your leisure-time physical activity. This doesn't necessarily mean joining a gym; it includes any recreational exercise you do. The evidence shows that doing more of this activity consistently leads to better fitness levels, which is a strong predictor of long-term health.