Ten Mile Race Planning

I want to plan for a 10-Mile event in 2021.

I need to pick up a little bit of speed to make the age grade national standard for the distance, a stretch goal for the upcoming year.

I wold like to tailor either the 10K or 1/2Marathon plan to make my goal attempt. My thoughts are to either add to endurance work (long runs) to the 10k plan or to substitute some of the weekly runs with additional speed work at the expense of the long runs to the 1/2Marathon plan.

Appreciate any suggestions as to how I might proceed.

Charles