Worth adding that there are a bunch of paid-for apps offering 'couch to 5k', but the 2012 podcast version by the NHS was such an elegant and effective idea—essentially, a free audio coaching program of progressive run-walk training.
https://podcasts.apple.com/us/podcast/nhs-couch-to-5k/id3943...
https://www.nhs.uk/better-health/get-active/get-running-with...