About Manish Kumar
Certified Personal Trainer & Sports Nutritionist
NASM-certified fitness and nutrition coach with over 10 years of hands-on experience helping people build strength, lose fat, and live healthier lives. Specializing in gym-based workouts with a strong focus on lifting technique, biomechanics, and practical exercise science. Through FitLifeRegime, sharing the tools, tips, and insights that have worked for hundreds of clients — helping you start your own fitness journey with confidence and clarity.
NASM Certified Personal Trainer
Nationally accredited certification from the National Academy of Sports Medicine (NASM), one of the most recognized certification bodies in the fitness industry worldwide. This certification covers exercise science, program design, biomechanics, nutrition fundamentals, and client assessment methodologies.
10+
Years of Experience
500+
Clients Coached
8+
Years Training Others
15+
Fitness Tools Created
Our Story
How FitLifeRegime came to be
FitLifeRegime began as a personal project born from a simple observation: fitness enthusiasts, beginners, and experienced athletes alike often struggle to find accurate, trustworthy fitness calculators that are free from hidden agendas, product placements, or misleading claims. Many existing tools online are outdated, use unverified formulas, or lock essential features behind paywalls.
After spending over a decade in the fitness industry — coaching clients in person, studying exercise science, and earning the NASM-CPT certification — Manish Kumar decided to build the resource he always wished existed: a comprehensive library of fitness calculators and tools that are free, private, transparent about their formulas, and grounded in peer-reviewed research.
What started as a handful of basic calculators has grown into a platform with 15+ specialized tools covering body measurement and proportion analysis, strength training programming, workout optimization, and fitness assessment. Every tool is built with the same philosophy: make it accurate, make it free, make it private, and make it genuinely useful for real people pursuing real fitness goals.
Coaching Philosophy
The principles that guide training, tool development, and client interactions
Proper Form First
Every client starts with a focus on lifting technique and biomechanics. Good form prevents injury and maximizes results.
Progressive Overload
Strength gains come from consistently challenging your muscles. Systematic progression builds real, measurable strength over time.
Recovery & Nutrition
Training is only half the equation. Proper recovery strategies and nutrition guidance support your body's adaptation and growth.
Sustainable Habits
Fitness should enhance your life, not consume it. Building routines that fit your lifestyle and become second nature over time.
Continuous Learning
The fitness world evolves, and so should your approach. Staying current with the latest research and techniques for the most effective guidance.
Expertise & Specializations
Areas of deep focus and professional competence
What Sets Us Apart
- Expert in fitness calculator algorithms, body proportion analysis, and exercise science formulas
- Specializes in lifting technique, biomechanics, and progressive overload programming
- Develops user-friendly, research-backed fitness tools used by thousands of fitness enthusiasts
- Creates personalized training and nutrition solutions grounded in evidence-based practices
- Committed to evidence-based guidance rather than fitness trends or unverified methodologies
- Focused on sustainable, long-term results through consistent habit-building and progressive adaptation
Core Specializations
Our Values
The principles that guide everything we build and publish
Science-Backed Approach
Every formula and calculator on this website is derived from peer-reviewed research, established fitness science, and validated protocols used widely in the fitness and exercise science community. We do not rely on trends, anecdotal evidence, or unverified claims.
Privacy-First Design
All calculations are performed entirely in your browser. We never collect, store, or transmit your personal data to any server. Your measurements, inputs, and results remain on your device at all times. We do not use tracking pixels, sell user data, or share information with third parties.
Free Forever
There are no paywalls, no subscription tiers, no hidden fees, and no premium locks on any of our tools. Every calculator and tool on FitLifeRegime is completely free to use and will remain so. Our goal is accessibility, not monetization of your data.
Honest & Transparent
We do not make inflated claims or present our tools as replacements for professional guidance. We openly display the formulas used, cite our research sources, and acknowledge the limitations inherent in any estimation-based tool. What you see is exactly what you get.
Our Mission
FitLifeRegimewas founded with a simple belief: everyone deserves access to accurate, science-backed fitness tools — regardless of their budget, experience level, or geographic location. Whether you're a beginner stepping into the gym for the first time or an experienced athlete optimizing your training, our calculators help you make informed, data-driven decisions about your fitness journey.
We combine peer-reviewed research with intuitive design to create tools that are both accurate and easy to use. No confusing interfaces, no unnecessary complexity, no hidden agendas — just the numbers and insights you need to track your progress, understand your body, and pursue your fitness goals with confidence.
Our commitment extends beyond simply building calculators. We are dedicated to maintaining and updating our tools as new research emerges, to being transparent about our formulas and their limitations, and to keeping every tool completely free and privacy-respecting. This is not a side project — it is a mission.
Important Notice
All tools and content provided on FitLifeRegime are for informational and personal awareness purposes only. The calculators on this website provide estimates based on published scientific formulas and population-level data. They are not a substitute for professional guidance from qualified fitness trainers, registered dietitians, or other certified professionals. Individual results may vary based on numerous personal factors including genetics, training history, body composition, and lifestyle. Users are solely responsible for how they interpret and apply the information provided by these tools. Please refer to our Disclaimer, Terms & Conditions, and Privacy Policy for complete details.