The Flash's Grant Gustin adorably loses race to Brandon Routh's son Leo

The Flash may be the fastest man alive, but Grant Gustin still has a ways to go. The star of the DC series on The CW adorably raced and lost to Leo, the son of The Atom actor Brandon Routh.

“Leo beat me in a race today. I wasn’t ready,” Gustin wrote next to video of the moment on social media. Routh, who also played the Man of Steel in Bryan Singer’s Superman Returns, responded, “When your dad is #Superman & #TheAtom, but you heart #TheFlash…HUGE props to the crazy talented and genuinely kind [Grant Gustin] for being such a great sport!”

Watch video below.

The Flash season 3 premieres on The CW on Tuesday, Oct. 4 at 8 p.m. ET.