Fitness
Nine fitness tests you can run on yourself, with numbers
Dr. Andy Galpin breaks fitness into nine measurable adaptations, with home tests and target numbers for each one.
Can you build muscle in a calorie deficit? The data
Dr. Eric Helms explains when body fat, not calories, decides whether you gain muscle in a deficit, at maintenance, or in a surplus.
What six back surgeries taught Mark Hyman about health
Mark Hyman on his mercury poisoning, chronic fatigue, and six back surgeries, why he rejects metformin, and why foundations beat every biohack he has tried.
Why more muscle alone will not fix metabolic health
Muscle is where glucose goes and where insulin resistance shows up first, but one leg studies and a large review show that gaining muscle mass is not the fix.
What a geriatrician says actually protects healthy aging
A geriatrician explains why power training, smart bone medication choices, and fall prevention matter more than trendy longevity supplements.
Contemplative aerobics: train your mind while you exercise
Neuroscientist Richard Davidson on pairing meditation with exercise, the four pillars of well-being, and why 5 minutes a day for 28 days changes your biology.
The real reason skin aging starts inside your cells
Skin aging isn't just about creams. Blood sugar, autophagy, and the muscle you build shape how your skin ages.
Longevity myths a doctor really wants you to unlearn
A longevity physician explains why obsessing over VO2 max or grip strength distracts from what actually matters: muscle.
Four common fitness and health claims that don't hold up
What the evidence actually shows on lifting and longevity, GLP-1 mood effects, calorie myths, and training with chronic fatigue.
Heart disease biomarkers your checkup probably skips
The heart disease biomarkers, from ApoB to insulin resistance, that predict risk long before symptoms or a standard checkup would.
Why the scale lies: 5 better ways to measure your health
Weight alone hides muscle mass, visceral fat, and insulin resistance. Discover 5 metrics that reveal your real health better than the scale.
The 4 biggest protein fears, debunked by the evidence
A physician walks through the actual studies behind protein and kidneys, cancer, bones, and the 30-gram myth.
How to actually train your brain's neuroplasticity
A neuroscience researcher explains what really drives brain plasticity, and why chasing flow states can backfire.
What the new ACSM strength training guideline changed
Coaches unpack the American College of Sports Medicine's new resistance training guideline and what actually matters for most lifters.
Do you need to train to failure to build strength?
Coaches break down training load, RPE, and why staying just short of failure can build more strength than going all out.