Originally Posted by Capt Tasty Cheeks
right now I am doing intervals and I do a little less than 10 minutes per mile for 3 miles. At this point my routine is getting a little bit easy. I'm thinking of either increasing speed and sticking with 30 minutes of cardio or maybe adding 2-4 more intervals into my routine.
Never let it get easy. That's the best advice anyone can give you when it comes to running, or really fitness of any kind. Constantly feel like death warmed over when you're done, and you will continue to improve at satisfactory rates.