tonight charlie crowson introduces us to kevin williams and rosslyn andrews. what brought them to the extreme brick over 4. >> reporter: inspiration can come from anywhere and at any time. for kevin williams and rosslyn andrews competitors in extreme brick over 4, their inspiration comes from different generations. pushing they will to achieve their best. >> it's very challenging. it causes you to basically find strength that you didn't know that you had. >> reporter: for kevin those rewards come from both weight loss and overall lifestyle change. >> i was overweight tired all the time. medications for my high blood pressure. my goal is main. my goal is to be there see my grandbaby grow up see my daughter finish college and see all the things that a person wants to see and not have to to feel fear of health issues. >> reporter: rosslyn wears the inspiration of her grandmother on her shirt. it's the motivation she carries in her heart every day since her grandmother died two years ago. >> and that was the most devastating thing i've ever had to encounter. >> re