Articles
Insights & Guides
Categories
62 Articles
Preventive Health
Cortisol Test: What It Measures and How to Read Your Results
A cortisol test measures cortisol in your blood, saliva, or urine to check for too much or too little. See normal ranges and how to read your results.
9 min read
Nutrition
Creatine Benefits: More Than Muscle
Creatine benefits go beyond muscle to strength, healthy aging, and cognition. See what the research supports, the best time to take creatine, and creatine for women.
8 min read
Nutrition
Electrolytes: What They Do and When You Actually Need Them
Electrolytes are minerals like sodium, potassium, and magnesium that regulate fluid, nerves, and muscles. Learn what they do and when you actually need them.
7 min read
Cardiovascular Health
Heart Rate Zones Explained: How to Find and Train in Each One
Heart rate zones split exercise into five intensity levels. Learn how to calculate your zones, find your max heart rate, and train in each one.
10 min read
Metabolic Health
How Much Deep Sleep Do You Need? Sleep Stages Explained
How much deep sleep do you need? Adults spend roughly 10–25% of the night in deep sleep. Here's what the sleep stages are and how much you need.
7 min read
Nutrition
How Much Water Should You Drink a Day? What the Science Says
How much water should I drink a day? About 3.7 L for men and 2.7 L for women in total fluids, per the National Academies. See what changes your needs.
7 min read
Performance
How to Improve Balance: Why It Predicts Longevity and Fall Risk
How to improve balance: train it directly with single-leg work, strength, and reactive drills. Learn why balance predicts fall risk and longevity, and how to test it.
8 min read
Nutrition
How to Improve Gut Health: A Practical Guide
How to improve gut health: focus on fiber, fermented foods, a diverse diet, sleep, exercise, and less stress. See the foods for gut health and signs to watch.
8 min read
Metabolic Health
How to Increase Testosterone Naturally: What Actually Works
How to increase testosterone naturally: the evidence points to weight loss, sleep, and strength training. See what works, testosterone levels by age, and low-T signs.
8 min read