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Improve your body through science-based fitness and physiology

About the Author

I’m Johan Latsky, the creator of CoreSifu. I hold a Bachelor of Science in Agriculture (BScAgric) and focus on studying and writing about exercise physiology, human performance, and nutrition.

Through CoreSifu, I translate scientific research into practical, easy-to-understand explanations that help readers better understand their bodies.

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Explore the core topics in science-based fitness and physiology.

Featured Guides

Are Pull-Ups Enough for Bicep Growth? Curls vs Pull-Ups
Do pull-ups actually build your biceps, or do you still need curls for optimal growth? Understand the difference in muscle activation and training effect.
Sit-Ups vs Crunches: Which Should You Be Doing?
Both target your abs, but they stress the core differently. Learn which is more effective for strength, hypertrophy, and spinal safety.

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05/13 2026

Energy & Nutrition

How Alcohol Affects Your Energy Levels (Sleep, Fatigue, and Recovery Explained)

publish on May 13, 2026

Learn how alcohol affects your energy levels, sleep quality, and next-day fatigue. Discover why drinking can leave you feeling tired, sluggish, and unmotivated.

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04/30 2026

Training Methods

How to Do Hamstring Injury Recovery Exercises Correctly After a Strain

publish on April 30, 2026

Learn the best hamstring injury recovery exercises to rebuild strength, improve mobility, and prevent re-injury with a safe step-by-step guide.

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04/08 2026

Energy & Nutrition

Diaphragmatic Breathing and Lymphatic System: The Hidden Link to Better Health

publish on April 8, 2026

Discover how diaphragmatic breathing and lymphatic system health work together to improve detoxification, boost immunity, and support faster recovery.

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03/28 2026

Energy & Nutrition

How to Feel Full Longer When Dieting: A Guide to Satiety

publish on March 28, 2026

Struggling with hunger while dieting? Discover how satiety helps you feel full longer, control cravings, and make fat loss easier without extreme restriction.

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03/04 2026

Human Physiology

How to Increase Deep Sleep Naturally for Better Recovery and Hormone Balance

publish on March 4, 2026

Deep sleep is not something you “force” at night. Master your daytime behaviors, and your nighttime recovery will follow.

What Most People Get Wrong About Their Body

Fitness Myths, Questions & Answers

Movement & Core Control

Build stability, control and efficient movement.

Training Methods

Build strength, endurance and adaptation.

Human Physiology

Understand how the body responds to training.

Energy & Nutrition

Fuel performance, recovery and body composition.

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