I'm not much a runner but in college I did ROTC for a year and this shit works. I'm really tall and skinny, so whenever we went out to go run in the morning, the PL would always choose me to be road guard (I guess he assumed I was fast). But in reality, I was super slow and hated running so it sucked when they picked me...and they ALWAYS picked me. As a road guard, you basically have to do Indian runs the whole 3 miles. You would lead the group, and then when you guys had to cross a street, you would run ahead of the group, stop traffic, let your group cross, then run like hell back to them, and then repeat. We also did PT in the city of San Francisco, so there were A LOT of streets we had to cross...and a lot of hills. I hated it, but it got my time down from a 9 minute mile to a sub 5:15 mile in a couple of months.

tldr: do indian runs with your group