Legs a bit knackered

My legs are feeling a little knackered today. Mostly in the quads. Put in an easy(ish - you know me by now) half hour interval session on the exercise bike down at the gym. Coupled with half an hour on the weights and I clocked up 210 ab crunches, a new record. Hopefully I will be able to train normally tomorrow but I guess I should force myself to take it easy. We'll see.....