Does it count as running if you stay at 5.0 on the treadmill?

Last week I ran or grandma jogged, however you want to call it, two times and went skiing once. I think skiing counts since it kills your legs! The first running day I did two miles and my knees ached and my hip started to hurt and I wondered what I was doing. The second running day I did three miles, only the third time ever in my life that I've run that far. The happy endorphins kicked in after mile 2 and I though that runners may be onto something.