are doing me good!!
I was discussing slow and easy runs with another runner at parkrun today - and he said that slow runs seemed to be slowing him down - and also that the small hills at this particular parkrun were "killing" him.
I told him about what I have been doing for the past few runs -- that is, "attacking" all hills while on easy and long runs. It definitely has been making the runs more interesting - and I swear that the much elevated heart rates during them are giving me more "oomph!! " during the non-stop parkrun.