Fifth Harmony have opened up on the what was their hardest dance routine to learn.

The girl group have teamed up with VEVO's Ask:Reply series to answer fan questions.

The quintet were asked about the hardest piece of choreography they have had to learn, with Normani Kordei replying:

"It would definitely be 'Worth It'. I feel like 'Worth It' was so hard only because we had literally like two or three days to actually learn it, and that was for the music video and then also for the tour.

"And it's also just on the next level - it's like a step up."

'Worth It' meanwhile features on Fifth Harmony's 2015 debut album 'Reflection'.

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Watch 5H's 'Worth It' video below: