Fitness & physical performance

Train with your hormones, not against them. We cover strength, hypertrophy, VO2 max, recovery, and injury prevention through an endocrine lens. Discover how training, nutrition, and daily activity can impact testosterone levels and support natural balance. Use estradiol balance for joint health, plan sleep taper cycles before competitions, and turn smart physiology into new PRs.

Are Quest Bars healthy or just better junk food?

Are Quest Bars healthy or just better junk food?

Dr. Susan Carter, MD avatar
Dr. Susan Carter, MD: Endocrinologist & Longevity Expert
Nov 24, 2025 · 15 min read

Quest Bars are generally a healthier choice than candy bars because a typical bar has about 190 calories, 18–20 g of protein, ~13 g of fiber, and ~1 g of sugar, but they’re still ultra‑processed and work best as an occasional protein “gap‑filler,” not a daily meal replacement. Here’s how that label can help or ...

Rowing machine muscles worked: How one stroke trains almost your entire body

Rowing machine muscles worked: How one stroke trains almost your entire body

Dr. Bruno Rodriguez, DPT, CSCS avatar
Dr. Bruno Rodriguez, DPT, CSCS: Strength, Recovery, and Physical Therapy Expert
Nov 23, 2025 · 10 min read

A proper rowing stroke trains roughly 86% of your body’s muscle mass by generating power through knee and hip extension (quads and glutes), transferring it through a braced core, and finishing with the upper back and arms. This guide breaks down which muscles fire in each phase—catch, drive, finish, recovery—and how to tweak form so ...

Celsius caffeine vs Red Bull: Which energy drink is really better for your body?

Celsius caffeine vs Red Bull: Which energy drink is really better for your body?

Dr. Susan Carter, MD avatar
Dr. Susan Carter, MD: Endocrinologist & Longevity Expert
Nov 23, 2025 · 14 min read

Celsius and Red Bull promise quick energy, but their caffeine, sugar, and stimulant blends hit a man’s heart, metabolism, and hormones in very different ways. Here is how to choose the lesser risk — or skip both when you should. “When men ask me about Celsius caffeine vs Red Bull, I tell them to think ...

Are perfect bars healthy or just clever marketing?

Are perfect bars healthy or just clever marketing?

Dr. Susan Carter, MD avatar
Dr. Susan Carter, MD: Endocrinologist & Longevity Expert
Nov 22, 2025 · 9 min read

Perfect Bars aren’t automatically “healthy” — despite whole-food ingredients like nut butter and honey, their glycemic load can trigger an insulin response that’s nearly identical to a candy bar when eaten outside intense training. An endocrinologist explains how sugar sources, sweeteners, and even snack format (bar vs. shake) shape satiety, fat burning, and metabolic health. ...

Red light therapy for weight loss: What really works and what’s hype

Red light therapy for weight loss: What really works and what’s hype

Dr. Susan Carter, MD avatar
Dr. Susan Carter, MD: Endocrinologist & Longevity Expert
Nov 21, 2025 · 13 min read

Red and near‑infrared light therapy (photobiomodulation) may lead to small, body‑contouring reductions in waist, hip, or thigh measurements—typically measured in centimeters—by stimulating mitochondrial energy production and influencing how fat cells release stored fat, but it has not been shown to produce large or consistent drops in body weight or BMI. Here’s what the research really ...

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