Run-walk, popularised by Jeff Galloway, alternates fixed running and walking segments from the start of a run, rather than walking only when exhausted. It is often dismissed as a beginner’s tool, but it has wider uses.
Common ratios: 1 minute run / 1 minute walk for new runners, up to 4-9 minutes run / 30-60 seconds walk for more experienced runners
Planned walk breaks spread the load and can let beginners cover more total time on feet
Some runners finish marathons in similar or better times with planned walk breaks because they slow down less late in the race
It is also useful when returning from injury or a long break
A return-to-running template using run-walk: week 1, 5x(1 min run / 2 min walk); week 2, 5x(2/1); week 3, 4x(4/1); week 4, 3x(6/1), progressing only if there is no pain during or the day after. Adjust to your own situation and medical advice.