Men are worried about their fertility. Enter the regrettably named trend of spermmaxxing

TL;DR

Men's sperm counts have significantly declined, with concentration dropping 51.6% and total count by 62.3% between 1973 and 2018.
Factors contributing to declining fertility include obesity, poor sleep, smoking, stress, steroid use, and environmental pollution.
Online advice, often termed 'spermmaxxing', is frequently inaccurate, with many claims being misleading or designed to sell products.
The gold standard for diagnosing fertility issues is semen analysis, but sexual function, including the ability to achieve erections, can be an everyday indicator.
Common misconceptions include the idea that semen retention improves fertility and that taking testosterone enhances it; in fact, testosterone therapy can harm sperm production.
Improving sperm quantity and quality involves lifestyle changes such as avoiding excessive heat (hot tubs, saunas), prioritizing good sleep, eating a healthy diet (like the Mediterranean diet), and engaging in resistance training to boost testosterone.

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