no problem unless you have more than 20% body fat, if you are over 10% its going to be hard, I ran in college, I put in a 4:22, I ran 5min mile repeats, glad I dont have to do it any more, you will need three things, a general fitness or aerobic base, speed work on the track as in 200 to 1000m repeats, aka, you will want your mama after these sessions, and of course a lean, body type, if you want to get serious I can give you a plan from 4weeks to 6 months if you are outta shape, glad to help I love to run and help others run fast