Frequently Asked Questions

Lion Fitness Workout is a science-based fitness platform that provides advanced calculators for BMR, TDEE, VO₂ Max, Creatine dosage, muscle potential estimation, and science-backed ebooks. Every tool is built on peer-reviewed research to deliver results you can actually trust.

Yes. All calculators, tools, and ebooks are completely free to use. No subscriptions, no hidden fees, no paywalled features. Our goal is to make science-backed fitness data accessible to everyone.

No registration or login is required. Open any calculator, enter your data, and get instant results — no email, no password, no account. Your experience is immediate and friction-free.

Our BMR calculator uses the Mifflin-St Jeor Equation, which is widely regarded as one of the most scientifically validated formulas for estimating basal metabolic rate. It accounts for age, weight, height, and sex — making it significantly more accurate than older formulas like Harris-Benedict.

TDEE (Total Daily Energy Expenditure) represents the total calories your body burns in a day — including physical activity. It's calculated by multiplying your BMR by an activity multiplier based on your lifestyle (sedentary, lightly active, moderately active, very active, or athlete-level).

Our VO₂ Max estimator uses the Cooper Test formula — based on the distance you can cover in 12 minutes. This is a widely-used, research-backed method for estimating maximal aerobic capacity without lab equipment. The result gives you a strong proxy for cardiovascular fitness level.

No — and we're transparent about that. The muscle potential tool is an advanced FFMI-based genetic estimation model, not a medical diagnostic tool. It provides a well-researched upper boundary based on frame size and height. Individual genetics, training history, and diet will always influence your actual ceiling.

All ebooks are completely free, while premium guides may be added in the future. The goal is to provide high-quality science-based fitness education accessible to everyone.

The ebook library covers fat loss, muscle building, nutrition, powerlifting, cardio conditioning, supplements, home workouts, recovery, and long-term fitness strategies backed by research.

Yes. All ebooks are optimized for desktop and mobile devices, allowing users to read or download them on phones, tablets, and computers.

Yes. Every ebook is written using evidence-based fitness principles, peer-reviewed research, and practical training methodologies used by athletes and coaches.

Absolutely not. All calculations happen entirely inside your browser. We have no backend server, no database, and no data pipeline. Your inputs — weight, height, age — never leave your device. What you type stays with you, period.

No tracking cookies, no ad networks, no analytics scripts. We don't use Google Analytics, Facebook Pixel, or any behavioral tracking tools. There are no third-party retargeting systems or affiliate trackers integrated into this platform.

Yes — and by design, not just by promise. Since everything runs client-side, there's no server that can be breached, no database that can be leaked. Your inputs are computed locally and discarded when you leave the page. This is privacy-by-architecture.

Try these steps first: (1) Hard-refresh the page (Ctrl+Shift+R or Cmd+Shift+R). (2) Use a modern browser — Chrome, Brave, or Firefox are recommended. (3) Disable browser extensions that may block JavaScript. If the issue persists, contact us via the support form.

Different platforms use different formulas — some outdated, some oversimplified. We use peer-reviewed, science-validated models (Mifflin-St Jeor, Cooper Test, FFMI). If another app gives different results, the discrepancy is almost always due to a different underlying formula — not an error on our end.

Yes. The entire platform is fully mobile-optimized with a responsive layout designed for phones and tablets. All calculators, layouts, and interactions work seamlessly on any screen size — no app download required.

You can reach us through the contact form below. We typically respond within 24–72 hours. For fastest resolution, describe your issue with as much detail as possible.

Absolutely — we love feature requests. Lion Fitness Workout is continuously improved based on user feedback. Use the contact form or email us with your idea. If it's science-backed and genuinely useful, there's a high chance it makes it into the platform.