I wonder why? I haven't added any extra weight and have been running pretty consistently at least on weekends.
However, since I ran a personal best of 54.59min for 10km, I have really struggled with my pace. I often start slow and find myself unable to pick up the pace as I proceed.
Today I decided to start a bit hard, but still faded and struggled to complete the race.
I know the timing is really just vanity, but it still feels good to run fast times on demand.