A Little Fit Will Do You

The latest research shows that the minimum daily moderate to vigorous activity—about 30 minutes per day, 5 days per week—does not have to be accomplished in a single session. As little as 10 minute chunks (there is no benefit less than 10 minutes) 3 times per day is as effective. For example, if your workplace has stairs, arrive a bit early and walk up and down the stairs for 10 minutes. Walk the stairs again in the first 10 minutes of your lunch break. Trek the stairs again for the third time for 10 minutes before going home for the day.

https://www.health.harvard.edu/staying-healthy/mini-workouts-can-add-up-to-better-health