"Stretch breaks" refers to short periods of time when you take a break from sitting or staying in the same position for too long, and instead, you stretch your body to relax your muscles and improve blood flow. Full definition
Try taking the stairs, going for a walk during lunch or taking stretch breaks at your desk. (mindbodygreen.com)
The only time I get up is around 45 minutes into the timed block when I need to get some water, take a short stretch break or visit the bathroom. (theauthorentrepreneurs.com)
On days when I am desk - bound for a long time, taking frequent stretch breaks is a must. (verymuchmia.com)