Staying active during pregnancy isn't just about keeping fit, it may also play a meaningful role in how your baby's muscles develop before birth. Scientific reviews suggest that regular, moderate physical activity during pregnancy supports early muscle formation in the growing baby.

One of the pathways involves thyroid hormones. Mothers who stay physically active tend to show higher thyroid hormone levels, which help guide muscle tissue formation in the developing baby. Exercise during pregnancy has also been linked to healthier blood vessel formation in the placenta, allowing nutrients and oxygen to reach the baby more efficiently, while also supporting better blood sugar balance for the mother.

The benefits don't stop at birth either. Staying active during pregnancy has been associated with changes in breast milk composition that may support a baby's long-term metabolic health. Research involving mothers with a healthy pre-pregnancy weight even found that staying active during pregnancy was linked to a lower risk of preterm birth and a notably reduced risk of childhood obesity.

That said, the right type and intensity of exercise can vary from person to person. It's always best to talk with your obstetrician before starting or continuing an exercise routine during pregnancy, so you and your baby can enjoy the benefits safely.