I don't. when I am beyond tired I rest. I read somewhere that humans are the only animal that does not rest when tired. We rush around, over eat, push too far.
take a nap. Once you are properly rested try again.
I know there was this lady on a Facebook group I am in was admitting that since she had started working at Amazon she had not been going to the gym at all and she was ashamed of herself. Well I piped in and told her that I have always heard that working 8-9 hours a day at Amazon was a workout in itself, others agreed. If I am that tired, no workout for myself.