eeehow far do i have to be able to run before it stops feeling like death?
if you are just starting out just keep adding a little distance on every run and your earlier runs will seem less like death. personally i found after a couple times doing 10k, doing the 1/2 marathon wasn't any more difficult, just meant adjusting pace to allow for recovery.
or do HIIT and every run will feel like death but you'll progress nicely.