Watch: See Kane Brown's Jaw-Dropping Fitness Transformation!Kane Brown is puttin' some miles on his treadmill. Indeed, the "Backseat Driver" singer offered another look at his health journey, showcasing his five-month progress while teasing more to come. "From April - August," Kane wrote on his Aug. 16 Instagram post, which shows how much he's sculpted his upper body over the summer, "and we just getting started!" And the 31-year-old-who shares kids Kingsley Rose, 5, Kodi Jane, 3, and Krewe Allen, 14 months, with wife Katelyn Brown-isn't the only one who's proud of his impressive progress.