These things have helped numerous people get faster times on there runs. They're called "intervals". There are eleventy-billion ways to do these . . . here's how I'm gonna do them today.
Repeat 3 times.
Sprint 30 sec. Jog 30 sec.
Sprint 40 sec. Jog 40 sec.
Sprint 50 sec. Jog 50 sec.
Sprint 60 sec. Jog 60 sec.
Walk 60 sec.
Have fun with this. Play with your breathing rhythm, your stride, your "RPM" and see how fast you can get.
Tomorrow will be a strength day.