During the two mile run on my diagnostic on Saturday my legs felt pretty good. The limiting factor definitely seemed to be my lungs.

This makes sense I guess since I’ve been doing a lot of casual and comfortable cardio and basic strength training but not a lot of interval or threshold work.

Based on that observation, on Sunday I went for a four mile tempo run. I didn’t have a goal except that whenever I felt comfortable I pushed myself a little harder.

I finished at sub-9 minute pace and with a negative split. I think the key to my run improvement is going to be a steady diet of intervals and hard tempo running along with a general increase in run mileage.

Sunday workout: 4-mile run, 35:45.