As a prerequisite for this plan, you should already be able to run for 20 minutes without stopping. We will start the plan by alternating running and walking, to get your muscles and joints used to low-intensity exercise and progressively, as the days go by and you make progress, you will end up able to run 45 minutes without stopping. Which means you will have achieved your goal.
Run the time indicated in 2 or 3 fractions with a "walking" recovery (very slowly, if necessary)
Continue to run the indicated time in 2 or 3 splits with a "walking" recovery (very slowly, if necessary)
You’ll make progress with rest periods in shorter sessions. Don’t worry about running slowly to finish without too much fatigue.
That's it, you’re in the last week of training. You’ll be able to run 45 minutes continuously. Follow the alternate running and walking of recent sessions. Have a good week.