The effects of vigorous intensity exercise in the third trimester of pregnancy: a systematic review and meta-analysis. "Findings from this meta-analysis indicate that vigorous intensity exercise completed into the third trimester appears to be safe for most healthy pregnancies. Further research is needed on the effects of vigorous intensity exercise in the first and second trimester, and of exercise intensity exceeding 90% of maximum heart rate" https://bmcpregnancychildbirth.biomedcentral.com/articles/10.1186/s12884-019-2441-1