Men who have physically demanding jobs and regularly lift heavy objects at work also have higher sperm counts and testosterone levels.

A new study that is part of a broader effort to explore how exposure to environmental chemicals and lifestyle choices affect reproductive health found the link.

“We already know that exercise is associated with multiple health benefits in humans, including those observed on reproductive health, but few studies have looked at how occupational factors can contribute to these benefits,” said study author Lidia Mínguez-Alarcón. She is a reproductive epidemiologist at Brigham and Women’s Hospital in Boston and co-investigator of the broader Environment and Reproductive Health (EARTH) study.

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