The Researchers Would Like to Conduct a Trial Using Gamified Exercise to Increase Cardiorespiratory Fitness and Intention to Quit Smoking Among Hardcore Smokers Who Are Also Physically Inactive.

The goal of this quasi-experiment is to learn if a gamified exercise works to improve cardiorespiratory fitness in physically inactive hardcore smokers. It will also learn about the effects of smoking cessation. The main questions it aims to answer are: * Does a gamification of a structured training program improve the cardiorespiratory fitness and smoking cessation behavior among smokers? * Is there any mediating effect from the level of physical activity between a gamified exercise and cardiorespiratory fitness? * Will the smokers engage in the gamified exercise within the 12-week intervention? This is a no-control group. The quasi-experiment will be conducted within one group (paired data).