You should still stay in the program but you should work really hard this summer to get your run time down. You can even do this on a treadmill. I had to get back into shape at one point and here is what I did. I would run on the treadmill every other day. What you need to do is to look at how fast your first mile is. Run as fast as you can on the treadmill for your first mile and then slow down for the rest of the 21 minutes. Do this for about two weeks. Then work on running as fast as you can for 1.25 miles then slow down for the rest of the 21. Do this for another week or two and then increase it to 1.5 miles. Then increase it to 1.75 and then to 2. However, keep running for a total of 21 miles. You will probably find that you can run about 2.3 miles in the 21 minutes if you work at it. As far as push ups and sit ups, you need to do them at breakfast, lunch, dinner and then at bedtime. The more you do them, the better you will get. You will find that as your sit ups improve, your push ups will improve also because you will strengthen your abs. Make sure that you do not overdo your exercise program in the beginning because you do not want to get injured.