This is the second time i've done C25K. Both times i've accelerated it.Last time I did.it outside Dec to Feb in South Texas and ran 3 days and took 1 day off.This time I am running on a treadmill... Much too hot to run outside I run 6 days a week, currently on week 6 day 2 and very mindful of aches and pains.I resistance train to try to avoid injury. I broke.my talus.in 2013so being.very.careful and.going very slow. I'm 51 I walk.at 2.6 mph and run at 3.2 (snailpace) but I reach peak heart rate at that speed and it's a tough work out, but.not reinjuring my foot is the priority I dont feel the need to go faster right now