Smiling at Ellen and the audience, Harry admitted that he still loves "working out to One Direction".
This brought out a good laugh in Ellen and the crowd, but sadly for us, Harry didn't reveal which songs were on his playlist.
We can only assume that his personal favourite "Olivia" would be included, and of course, to do Niall proud, "Act My Age"
It's a stark difference to what other members of the band have said about their time together.
Liam Payne, whilst slamming his former bandmates like Louis Tomlinson and Harry, has admitted that staying in the band might have killed him.
"It was really scary at first," Liam explained about the band initially breaking up... or going on 'hiatus'. "But I needed to stop, definitely. It would have killed me. One hundred percent."