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Dr. Jackson Taylor, PT, DPT

Coach · Author · PT

I am an author, strength coach, physical therapist, father, husband, and hack golfer looking to help build more capable men. Subscribe to my weekly newsletter below!

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The Saturday Standard · Five hours and your testosterone falls

VOL. 2 · MAY 16, 2026 Saturday morning. Coffee first. Five things. THE RESEARCH — Five Hours of Sleep Drops Your Testosterone In 2011, researchers at the University of Chicago restricted healthy young men to 5 hours of sleep per night for one week. Their daytime testosterone levels dropped 10 to 15% — a swing the average man doesn't see across an entire decade of normal aging. The good news: it bounces back. Once those men returned to normal sleep, their levels normalized. Testosterone...

3 days ago • 2 min read

VOL. 1 · MAY 9, 2026 Welcome. Five things every Saturday: research worth knowing, a thought worth keeping, an action worth taking, a book worth reading, and a closing note from me. Read it slow. Coffee first—always. THE RESEARCH — Low Fitness Is More Dangerous Than Smoking A 2018 study in JAMA Network Open (Mandsager et al.) tracked 122,000 patients across 23 years, measuring cardiorespiratory fitness via treadmill testing. The bottom 25% in fitness had a mortality risk 5x higher than the top...

10 days ago • 2 min read