I've noted that for the last 8 months there's been a steady increase in my running distance. This comes after stopping in April 2019 when it seemed that some discomfort around my left heel/ankle/achilles was getting worse. After some rehabilitation work I started to swap in walking instead of running, keep up with circuits and limit bouncing loading.
Unfortunately the increase in running has occurred with a reduction in swimming but there are only so many active hours in a week! Now I need to keep this level for a while, a goal of 120km a month is probably right for while.