Tempo run :4k

As I am starting to incorporate these workouts once again, I only started with 4k, around 3 weeks ago I did 4k in 18:38 but lasted like 3 days with sore legs. Hope that it does not happen this time. The splits for today's 4k were 4:38,4:45,4:46,4:32, total time was 18:42(9:23,9:19). Finished up faster but that was not on purpose. Did not feel that good during last km. But it would get interesting after a while. Happy Sunday all!