What changes trimester by trimester
In the first trimester, fatigue and nausea are common while the bump is not yet limiting, so many women continue much of their usual routine. In the second trimester, the growing uterus and ligament laxity prompt adjustments: many guidelines advise limiting prolonged exercise lying flat on the back (supine) past mid-pregnancy because it can compress major blood vessels, and avoiding activities with fall or contact risk. By the third trimester, size, balance changes, and pelvic-floor load usually mean lower intensity, more comfort-led choices, and reduced impact.
These are general patterns; every pregnancy is different and some require specific restrictions.
Intensity and load principles
General guidance favors staying active at a moderate, conversational intensity, using perceived effort rather than chasing maximal lifts, and progressing or regressing weight based on comfort, symptoms, and how the core and pelvic floor cope. Hydration, avoiding overheating, and stopping for warning signs are emphasized.
This is general educational information, not medical advice. Exercise during pregnancy should be cleared and guided by the individual's obstetric provider, who can flag contraindications and personalize limits.