left vs right
The day after the 50-miler I was limping, not because I was sore - I was - but because my left leg, the calf specifically, hurt much more than the right.
I had read that running uphill is hard on the calves.
Two days later my right leg wasn't sore anymore, but the left one still hurt, and it hurt for two more months afterward, or even longer.
Not sure why the difference - give or take one, I took the same number of steps in this race with both the left leg and the right, and I didn't strain or stretch one more than the other.