Maybe it's that I haven't done intervals for a long time, or maybe there is just some weird part of my brain that finds them irrationally enjoyable. Chevy and I had a great day today running in the muddy woods. The protocol was to run multiple 15 minute intervals while maintaining my heart rate at its aerobic threshold. This technique will improve speed and endurance for K2. Chevy is naturally better at running intervals than I, as I came around a corner and found him sitting in the middle of the trail with a disappointed look on his face.