Do not go! When you're that sore, it is not time to work those muscles hard in the same way; it will just trash them and drive you into the ground with exhaustion.

BUT: do something else instead.

Ideally, some kind of active recovery (yoga, stretching, swimming, foam roller time) that will loosen things up, help your muscles recover, and generally keep you on the Doing Something track.

Thursday is not far away.