Jennifer Aniston has said that filming the Friends reunion took its toll emotionally, saying it was "brutal" and "took us all down way harder than we anticipated".

The highly-anticipated reunion of the beloved 90s sitcom saw the six main cast members head back to the show's original set for a trip down memory lane.

Speaking on an episode of the podcast Literally! With Rob Lowe, Aniston admitted it was more difficult than they were prepared for.

"It took us down way harder than we anticipated, for sure," she told host Rob Lowe. "In your mind you think, 'Oh, this will be really fun to time travel'.

"It turns out, ooh, ouch, it's kind of hard to time travel."

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The Morning Show star said it was surreal to be back on the Friends set which was exactly the same as it had been back in the day.

However, while the set was the exact same, she and her former co-stars, Courteney Cox, Lisa Kudrow, Matt LeBlanc, Matthew Perry and David Schwimmer, were not.

"You know, [in] 16 years, a lot has gone on for each of us," she shared. "And 16 years ago, we were all sort of wide-eyed and bushy-tailed, and sort of had our whole lives ahead of us - even though we were heartbroken to say goodbye to these 10 years and this family and these people and the job we all loved to do.

"It brought so much joy to fans, and ourselves. It was like having a happy pill every single day.

"So going back there, it's nostalgic in a way that's kind of also a little melancholy. Cause a lot has changed, and we have all gone down different roads. Some easy and some not so easy for each of us.

"It was brutal."

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Aniston said that she couldn't stop crying even though there were cameras everywhere. Her strong emotions were shared by her former co-stars.

"There was a period where we were all kind of in a puddle. Maybe David didn't, I don't think we broke David."

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