The core activity of Lehner ZerneZ encompasses three main areas:
1. **Financial Services (Lehner Fiduziari)**: The company provides financial services, including accounting, tax returns, and property management.
2. **Sports and Coaching (Lehner Active)**: Lehner Active offers a range of activities, including sports, hunting, wildlife observation, snowshoeing, prepping, and coaching. Additionally, 'active meditation' and special events are also offered.
3. **IT Support**: The company provides IT support services to assist customers with technical issues.