Niall Horan Shows Off His Songwriting Chops During 'Instant Song Challenge' - Watch Now!

Niall Horan‘s latest hit might be a metal-inspired ode to workouts!

The 23-year-old singer teamed up with Jimmy Fallon for a round of “Instant Song Challenge” and the results were hilarious!

Fans submitted fake song names like “Witness the Fitness,” “Quickly Clicky Pen” and “Stepping on Toes” that the duo used to create original songs!

Niall and Jimmy came up with songs on the spot, including a Metallica-style jam, and we’ve got to say, we’re pretty impressed!

Check out the entire video below…