Training plans not Right for me

Today's walk\run did not go as planned.  It was supposed to have been 2 mile, but I went 3 miles. I was supposed to run for 90 seconds and then walk for 4 minutes.  This sounded easy enough.

I did the 5 minute warm up walk.  Then I ran.  I thought it was a good pace but could only get to 75 secs.  My rhythm was getting meed up because I had to keep track of the time.  I walk for about 4 minutes and then ran 1 minute because again the rhythm was off from watching the time..

I have to change the method of the training.  I cannot keep stopping.  I am ok with a few walk breaks and then restart running.  I am changing to a system that allows me to run as much as I can and then walk the rest.  I would try to get more running in but it will depend on my body.  I am moving the training to a "track" that I can use laps to quantify how much running I can do.

I hope this works better.  I can push myself without worrying.