Jennifer Aniston is known for her gruelling workout routines and staying fit and healthy into her 50s.

But even the fitness-fanatic Friends star, 55, has admitted her 'doesn't want to work out' sometimes. The LA-based actress uses Pvolve, a low-impact, high-intensity 'functional' work-out programme that involves moving planks (going from a downward dog position to a plank and back again).

On Monday, Jennifer took her fans through a few quick clips of her sweat session and ended the video with her collapsing at the end of her push-ups. 

'Oh god, you know those days when you just don't wanna do it, you just gotta do it,' she said in the clip.

Long-term followers on the star might be surprised to see the intensity of the star's workout, as she recently said she wanted a change from 'breaking her body' with high-impact cardio.