5k's worth of intrvals on the treadmill today. 400m effort followed by 200m harder effort and then 200m recovery. Rinse and repeat. I could feel it in my legs come the last couple so the effort was about right. Didn't push things too far over as I'm still not ready to risk over egging it. I'm happy to inch forward slowly rather than crash and burn like before. It's either an easy bike session or full rest tomorrow. See how I feel.