Even coaches make mistakes.
Even coaches can make errors in their own training.
Best Racing Tips: Have a plan for the race!
Don't waste all the hard training you did before the event by making these race day mistakes!
Download it now: For any race or runner speed!
In my case, I did a hard race-pace session with a lighter pair of shoes than I normally had been. That along with not actually doing many workouts like this lately due to snow/ice/etc meant that my calves really took a beating.
For the last few years, I have had a quarter sized area on my left calf that has been my only real problem area. Well, the problem area is my brain not being mindful enough to know such a workout was going to overload my calves, but that is another discussion altogether.