[Grace Themes]

Hi,

The sample data is not available for Sports Club Lite free theme
The Sports Club PRO theme comes with XML file of demo data.

To customize this free theme, first create all pages for slider, services and welcome section with Featured Image
Then Go to the Appearance -> Customize -> Theme Options Panel -> Slider/services/welcome -> Select Page

Please check the documentation
http://www.gracethemesdemo.com/documentation/sports-club/#homepage-lite

Regards
Grace Themes