I've successfully transitioned to running three days a week (9 miles). This week, due to meetings at work, ended up having to run two days in a row (I usually take one day off between runs). No problems with my ankle tendons.

This Sunday will be my first really cold weather run of the season (should be in the 30s). I'm going to start adding distance to my Sunday run - short term goal is to run 10 miles a week. That will be two 3 milers and one 4 miler a week.