Young adults are the most at risk of sport dropout: once they reach adulthood, they abandon physical activity or sport for various reasons: mainly family and work. Even before the pandemic, there was a decline in physical and sporting activity in adulthood. Now the issue of inactivity affects not only those who had been sedentary for years, but also adults who stopped practicing sport and physical activity during the lockdown Starting from improving the comprehension of young adults’ dropout reasons and of the impact of COVID on adults’ lifestyles, the project delivers an innovative training method, the Katsura System (KS), capable to keep adults active all life spam, at work, at home, in free time. KS is a holistic method which takes its cue from non-competitive martial arts, and aims at keeping adults self-motivated to adopt a more healthy, sustainable, greener and active lifestyle. It is a system of basic exercises and movements that are normally practiced in the preparatory phase of the most refined traditional Far Eastern martial arts (Aikidō, Tai-chi-chuan, Chi-Kung, Kinorenma, Raja Yoga). KS raises from Budō tradition; and combines physical movement with correct breathing associated with visualization thus to let practitioners to approach themselves and the surrounding environment with kindness, courtesy, courage, loyalty, sincerity and determination. KS is designed to enjoy multiple benefits of daily simple physical activity, the effectiveness of which is proven by dozens of scientific studies and research: it brings PA into contexts where people live, study or work. Staying active all your life does not only mean continuing to play sports, but adopting healthy lifestyles, integrating physical and mental well-being, carrying out recreational activities and knowing how to integrate adequate physical activity at different times of the day: at home, in the office and over time free.