"Undue stress" refers to excessive or unnecessary pressure that is placed on someone, causing them to feel overwhelmed, anxious, or strained. Full definition
After 8 months your child's weight will cause the forward - facing option to be uncomfortable for you, but also cause undue stress on your child's spine. (shop.sproutsoup.com)
This is a great movement for working the lower abs without putting undue stress on the lower back. (bodybuildingforyou.com)
This causes a lot of undue stress on your low spine, and it goes against the goal of a flat stomach. (truthaboutabs.com)