Roller Derby peaked in the 1970s, but then disappeared for decades. And now, it's back with a vengeance. Thousands of modern-day roller girls are registered with the Women's Flat Track Derby League. And Sunday night, Charlotte's own derby team held its first home-turf bout. WFAE's Julie Rose takes us inside the team's practice. *Web Extras: Hear Charlotte's Roller Girls explain their injuries. Listen Click here for a link to the team's injury gallery.