Build With Chels

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Sedentary: No exercise and have a desk job

Exercise multiple times a day/High School or College Athlete

Working days

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Role of dietary intake in weight loss

Exercise and Physical activity linked to weight loss

Basics of calorie counting by Harvard Health

Diet and exercise for weight loss - Research paper by US National Library of Medicine

Research on weight loss, diet and workout

Source of food database used in the app

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Personal Trainers In Your Pocket

Chelsi Kottwitz

Hey there! I'm Chelsi Kottwitz, an ISSA Certified Elite Personal Trainer, Nutritionist, Bodybuilding Specialist, and the owner of Build With Chels and MamaRilla Sportswear.

When I'm not in the gym training clients or behind my laptop cheering on my online fitness community, I love spending time with my husband, Brandon, and my son, Kingston. With a background in sports, including softball, volleyball, dance, and cheerleading, fitness has always been a significant part of my life.

At 16, I faced a major car accident that left me with severe injuries, including a broken back, elbow, wrist, knee problems, vertigo, and a concussion. My confidence was shattered, and I was challenged both mentally and physically to recover. Through physical therapy and recovery, I discovered my love for lifting weights.

Fast forward about 15 years, and I’m still on my fitness journey, now teaching others how to stay positive and energetic through life's curveballs. Before founding my first business in 2021, I worked as a Finance Manager for a dealership and an Industrial Trades Manager for a staffing company. Building my own business from the ground up, while managing wifey and mama duties, taught me the importance of efficient and timely workouts. I know it’s possible to get and stay in shape as a working mother—if I can do it, so can you!

I have all the resources, tips, and tricks to help you get into shape while balancing everything as a mom, wife, and career woman. My goal is to teach my clients how to eat and train sustainably around their busy schedules. I understand that life is full of careers, kids, family, sports, work events, grocery shopping, and daily home tasks. These responsibilities can interfere with your health goals, but my job is to help you incorporate simple habits into your daily routine. By doing so, you won't miss out on the benefits of living a healthy and fulfilling life—and hopefully, we’ll share some laughs along the way.

Let's kick ass together and make your fitness goals a reality!


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Build With Chels Website

MamaRilla Sportswear

Welcome from Chels

Are you ready to shed some fat and sculpt your best beach body just in time for Summer or vacation? If you answered YES, then this is the program for you. Bikini Bod is an 8 week intense program to help you shed fat while still building strength and stamina. 

Bikini Bod

Welcome to the Gorilla Grit Club! This all-inclusive program is your golden ticket to a transformative journey that combines the best of fitness and nutrition, bringing together every program offered on our app under one powerful umbrella plus a personalized meal plan.

Chelsi Kottwitz, Certified Personal Trainer and Nutritionist will be with you every step of the way-helping you hit your goals in a sustainable manner.

Our all-inclusive approach ensures that you have unrestricted access to a variety of workouts, from strength training to high-intensity cardio, coupled with personalized meal guides crafted by your top-notch Nutrition Specialist. It's not just about building a better body; it's about unleashing your inner gorilla – that primal force within each of us that craves strength, confidence, and vitality.

Gorilla Grit Club

Grow both physically and mentally as a woman, especially working moms and busy professionals, move faster, unleash every tool and resource that helps you learn how to eat properly, be more functional and build muscle at any level. 

MamaRilla Program

Our 16-week booty building fitness program for women is designed to help individuals achieve a stronger, shapelier, and more toned posterior. 

Your ISSA Certified Elite Trainer, and Glute Specialist, Chelsi Kottwitz, focuses on developing the glute muscles through targeted exercises and a structured block periodization workout regimen plus teaches you how to each specifically for GLUTE GAINS; helping you build healthy, peachy habits. 

Gorilla Glutes program is a comprehensive and goal-oriented approach to achieving a firmer, more sculpted rear end. This program is specifically designed to help women of all fitness levels improve their glute strength and aesthetics.

Program Structure:

Weeks 1-4: Building the Foundation - Establishing proper form, glute activation and mobility.

Weeks 4-8: Progressive Overload - Increasing the intensity and adding resistance.

Weeks 8-12: Glute Shaping - Focusing on muscle definition and sculpting.

Weeks 12-16: Perky Performance - Hypertrophy efficiency and aesthetic results.


Gorilla Glutes

This challenge is about more than fitness; it's about empowerment, self-discovery, and building a community of like-minded women.

MamaRilla Challenge

Finally, a fitness and nutrition program for all the dudes and dads out there. 

The Silverbacks program compliments the MamaRilla program; making it perfect for couples to dominate their fitness goals together!

Silverebacks Program

If you struggle with accountability, have a lengthy goal or looking to educate yourself more in depth of how to elevate your body and mindset with nutrition and training; and want to work more one on one with me, this is the best plan for you. 

Online 1:1 Personal Coaching 

Tight & Tone (Step 1) program is for anyone beginning or freshening up their fitness lifestyle. This program lasts for 8 weeks and if followed faithfully will help reduce the appearance of body fat by tightening up your muscles in your body, giving you a tight and toned appearance. **For greater results I recommend pairing up the Build With Chels meal program**

Tight & Tone (STEP 1)

Tight & Tone, Step 2 program is for anyone at an intermediate level of gym knowleadge or have successfully completed the Tight & Tone, Step 1 program. This program lasts for 8 weeks, can be done at-home and if followed faithfully will help reduce the appearance of body fat by tightening up your muscles in your body, giving you a tight and toned appearance. 

**For greater results I recommend pairing up the Build With Chels meal program**

MamaRilla

MamaRilla Challenge

MamaRilla 365

Tight & Tone 8 Week Program

Bikini Bod-GYM

Bikini Bod-HOME

Tight & Tone, Step 1

The Perfect 4-week Plan

Spring Into Shape

Slay in 2024: Booty Burn & Bold Biceps

30-Day Fitness Kick-Start