lol I went to basic back in '98 two weeks out of high school I came off a four year drug binge right into it. The only exercise I had up until then was BMX riding and fuckin.

My advise don't worry so much about the long runs because when you run in formation it's slow as shit anyway and if you fall out of one of those you are a failure at life. Work on your two mile and sprints. But yeah push ups and sit up are a must. If you don't want to stick to doing just those work on the target muscles for those particular exercises...... IE push up= triceps/pecs situps= abs/obliques/hip flexors.