Joined: Aug 2013
Do school P.E. hours count? In that case the last time I had some exercise was around 5 years ago. If not it's 11 years ago.
To be honest my stamina has been constantly decreasing since my peak at 13 years old, now I guess I couldn't run for 100 meters without having to stop. But that said I'm just sligthly overweight, not fat.
It's not even anime's fault, my degrading had already begun when I started watching them, and I just keep caring less and less about my health as time passes so I likely won't stop this process any time soon.