my legs ache

I did 2 mi at incline on tready and followed that up with a yoga class that ended up having a TON of legwork. It was exhausting and I had to quit on several sequences because my legs almost gave out! Tonight I'm just aching and I took a muscle relaxer and I'm still aching! Maybe still fatigued from yesterday but I wasn't the least bit sore or even tight this morning. Anyhoo, a good day I think.