Ahhh! The rest day.   Love running as I do, The day off is good too.   I currently run just 4 days a week following a bout of plantar fasciitis combined with some post tibialis trouble.  It left me with 2 very sore areas on my left heal.  2 months off and after nearly 2 months of running, I'm back up to 30mpw (miles per week).  I do a  10 (miles), 9, 8 and a 3.  I've got the 3 miler tomorrow.  The aim of the longer runs is to get my aerobic fitness back.  I did consider  cutting the 9 and 8 and doing 3 shorter midweek runs to make 5 runs per week but  I find my heel is much happier having a day off after each run.  This won't continue, but whilst I'm doing rehab I'll give it what it seems to need. What to do on a rest day? For me, today, not much.  I played with my synthesizers, supervised my son through some home-schooling (argh!) and played some No  Man's Sky.  The only active thing I did was a ...