I don't know what the problem is with my ankle but every now and then it just gives way. I have had episodes of that since a bad ankle injury years ago and there doesn't seem to be anything really wrong with it, it just goes through spells of doing that.
I didn't want to stop doing the program if I didn't have to so I decided to use the treadmill for the last couple of runs before graduation just so as not to aggravate it.
It's hard work on the treadmill- the display stopped working so I don't know how fast I was running but it feels a lot faster than I normally run and being indoors I get much hotter than I do running in the park so I was glad when it was finished! My sister and kids and I plan to do our graduation run on Sunday.