Starting Over follows mountain-ultra-trail runner Sage Canaday over the course of a year as he grapples with a life-threatening illness, personal tragedy, and an uncertain future for his running career. Motivated by a love of trail running, the ultrarunning community, and the support of his partner, Sandi, Sage works to overcome these setbacks and make it to the starting line of a competitive ultramarathon, the Canyons 100K.