Progression run

I woke up too early (after not enough sleep) to get my workout in before the heat arrived. I drove out to Alameda and started the run at a nice & easy pace (zone 1-2). At mile 3, I picked it up to 8:50 pace, which felt really good. That pace, on the flat waterfront trail, made my legs happy :) At mile 5, the real work began......So, I pretended like I was running another 5K and dropped to 7:54 pace. At that point, I could feel a bit of tiredness in my legs, and I was breathing very hard (zone 4). I jogged for a couple minutes and then walked for a few minutes to cooldown. Best part of the cooldown---getting an iced latte!