Depends if your mentally tired after a long day at work or physcially tired.
If its mental, you won't ache as much but you just won't have any go in you. At such times I go. If everything hurts/aches, THEN have the day off because thats when doing the training will only make you worse. Its a thing to do, differentiate between the two though, I still have problems.
I'll say this though, after the warm up I'm ready to go if mentally tired and I'm always glad I went. Physically tired, I feel dead after 5 minutes skipping and it goes down hill form there