What men should know about their sperm — including how to strengthen it

The ability of sperm to swim effectively is consistent no matter the country and highest in summer no matter the climate

Improvements in concentration and motility take time to show. New sperm typically need 72 days to form, Picture: iStock

Sperm motility is consistent across climates, but varies with the seasons, a study published in the journal Reproductive Biology and Endocrinology has shown.

The study analysed semen samples from 15,581 men aged between 18 and 45 in Denmark and Florida, and the researchers were from Britain, Canada, and Denmark.