Your domain name should be short, easy to remember, and related to your business. Considering these factors, we recommend registering "smartsportsstadium.com". This domain name directly reflects the nature of your business and will be easy for customers to remember when searching for your services online.

Regarding other aspects of your business like wallpaper, track maintenance, and yoga, it might be beneficial to create subdomains or separate pages on your website dedicated to each of these areas. For example:

- Wallpaper: wallpaper.smartsportsstadium.com

- Track Maintenance: maint(smartsportsstadium.com

- Yoga: yoga.smartsportsstadium.com

This way, you can easily cater to specific customer needs while still maintaining a strong brand identity under the main "smartsportsstadium.com" domain.