Welcome to Grit Life Fit

Train with Courage!

Free Consultation: Fill out the form below to arrange a free fitness and nutrition consultation.

Free Fitness & Nutrition Consultation

Inquiring minds, new clients and members (annually) can schedule a free 45-minute consultation to discuss your health history and specific fitness and/or nutrition goals. Your training plan is progressive, based on practical science and safe techniques to achieve your goal. We will continue to assess progress throughout your membership. No obligation to buy. In the Comment section include the best day/times that work for you.

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By opting in, you agree to receive periodic text messages & emails from Grit Life Fit. Your information will never be shared. Reply STOP to cancel. Standard rates may apply.

7

Certifications

17

Years Experience

Personal Training

Personal training is one-on-one fitness instruction with a trainer. You'll get personalized guidance to help you lose weight, build muscle, and meet other fitness goals, whatever they may be.

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Online Class Membership

Weekly classes keep you fit and healthy with a wide variety of workouts to improve your overall strength, aerobic endurance, range of motion, and flexibility. Five unique classes are offered every week. As a member you have unlimited access to the online classes plus you will have access to past on-demand workouts. Non-members can signup and take a class whenever you like.

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Why Choose Grit Life Fit?

Whether you're just starting your fitness journey or looking to enhance your routine, Grit Life Fit provides a supportive and motivating environment.

Our team is dedicated to helping you achieve your personal goals, ensuring you have the best experience possible.

Trusted By Our Members

5 / 5 Stars

"I’ve been training with Kristina for several years for personal training and group exercises both live and online. I love the variety of classes and appreciate that there’s something almost every day. Her approach is fresh and down to earth and she’s a wealth of sensible information for fitness and nutrition."

Sue

Somerville, MA

5 / 5 Stars

"I have been working out with Kristina online for over three years now. She offers five very different classes a week and it’s hard to say which class is my favorite but I always get a great workout. I especially like her Tuesday Balletone Strength and Mobility class which includes foam rolling. Every class begins with a solid warm-up and ends with stretching and taking a breath together. There’s usually a few minutes after to say hi and bye to everyone so you feel like you’re part of a community. I try to get to three or four classes a week and, since they’re online, I only need a few minutes to get ready and lay out the minimal equipment needed (usually a mat and dumbbells). I really appreciate being able to work out at home but especially being able to keep to my workout schedule if I’m traveling!"

Sandra

5 / 5 Stars

"Kristina is a top-notch trainer who keeps classes engaging and really listens to your specific needs and responds - whether it’s for personal training or class workout modifications."

Lydia

Somerville

5 / 5 Stars

"I have worked with Kristina on two lots of personal training programs and thoroughly enjoyed our sessions working together. Kristina always took great care and attention in exploring my goals and how to make the best use of our time. Having an experienced professional guide me through new and varied routines held me accountable and also brought about really positive results for my wellbeing. I would highly recommend working with Kristina to anyone in the area!"

Alex

5 / 5 Stars

"I have been taking classes with Kristina for a very long time even before zoom exists!! I love all her classes. Especially the Saturday Bootcamp, HIIT, ballet-tone & strength, core, and cardio kickboxing. I love the classes and I always enjoy all the classes both online and in person! Kristina is also very good at giving me modifications during my pregnancy and when I have injuries."

Jeanny

Somerville, MA

5 / 5 Stars

"I've been working out with Kristina since 2018. When the pandemic hit, she was the first one to start online classes, and I've been a loyal member of Grit Life Fitness ever since 2020. There are so many things I love about Kristina's workouts. I love the variation--she switches workouts every few weeks, so the content feels fresh. She incorporates full body moves, which are necessary to manage lower back pain and improve strength, endurance, and overall well being. She also challenges you when necessary and incorporates relaxation and stretching. What a great balance!! We've had some memorable workouts with her--such as the 10 minute plank challenge of 2022! I continued to work out with her throughout my pregnancy, modifying her moves as necessary. Now, postpartum, her workouts are helping me regain my strength. I can't thank Kristina enough for her hard work, creativity, and infectious positive attitude! I am a Kristina fan for life!"

Shilpi

Cambridge, MA

3 / 6 Reviews

Frequently Asked Questions

Check out the most frequently asked questions about Grit Life Fit.

Still haven't found the answer?

How do I schedule Nutrition Coaching with you?

Nutrition Coaching is a 12wk minimum commitment or longer. If you are interested in working on improving your nutrition and health fill out the consultation form on my home screen. Online coaching session are weekly (30 minutes) and progress is based on your pace. I look forward to meeting with you.

Why should you work with me?

Working with a personal trainer is a big decision. You are taking control over your health, longevity and vitality. Exercise is the best medicine that we often overlook or don't know about. My background of 16+ years of exercise and fitness give me an unique approach and perspective. I have extensive experience with working with individuals of all age levels and health concerns. I adapt and adjust for what your body needs based on your specific fitness goals. Movement assessment and pain-free movement are the foundation of building strength. We progress at a pace that fits your season of life and your lifestyle. Most of my clients are busy and have many demands on them, they have decided to prioritize their health and fitness so they can do all the things they want to do. We always consider other factors in your training like sleep hygiene, nutrition, hydration, stress management and non-structured physical activity. I do not do cookie cutter programming or fads. We stick to safe, effective and efficient routines that get you to your goals.

Payment Policies

Grit Life Fit takes Credit Card, Venmo or Cash.

Payment is due on or before your first session of a package or any one-off session.

Credit card transaction have processing fees of 3.25%. Venmo or Cash is preferred if possible.

Venmo Grit Life @GritLifeFit

Please contact courage@gritlifefitness.com if you wish to request a refund. Refunds are assessed on a case by case basis.

Raymond Park Bootcamp Scheduling

Raymond Park Bootcamp is a unique organic neighborhood community in the heart of Cambridge, MA. If you have the pleasure of attending classes, here are a few policies starting November 2025

First class is free
You will create a member account with an username and password.
Once you have an account you are responsible for scheduling your classes.
Classes need a minimum of 6 participants to run.
Classes with 5 or less participants will be canceled the night before at 8:00pm.
You can schedule up to 7:00pm the day before a class.
Classes can be scheduled 30 days in advance.
There is an App Gymdesk for members. The image is a red G. Download the App from Google Play or the Apple Store
If you are a NO SHOW and their were less then 6 participants at class you will be charged 1 class.
Your account tracks your classes, you are responsible to renew your classes prior or on the day of the next class.
If you come to class without signing up you will be you will not be guaranteed use of equipment, if equipment is being used.

Schedule

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11/30/2025 - 12/06/2025

30 Sun 1 Mon 2 Tue 3 Wed 4 Thu 5 Fri 6 Sat

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5 Fri

6 Sat

12:00am

1:00am

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5:00am

6:00am

7:00am

8:00am

9:00am

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11:00am

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Raymond Park Bootcamp

6:15 - 7am

5 Participants

Rick Grudzinski

6:15am - 7:00am

Raymond Park Bootcamp

Kristina Courage Book 5/20

Raymond Park Bootcamp

Monday, December 01 · 6:15am - 7:00am

Instructors:

Kristina Courage

Book Waitlist

H.I.I.T. Class

6:15 - 7pm

5 Participants

6:15pm - 7:00pm

H.I.I.T. Class

Kristina Courage Book 5/15

H.I.I.T. Class

Monday, December 01 · 6:15pm - 7:00pm

Instructors:

Kristina Courage

High Intensity Interval Training is a bodyweight workout that requires a base of strength and aerobic conditioning, good stability and no injuries. The class always offers options for low-impact and focuses on form over fatigue. All ability levels are welcome and anyone new should go at 50% intensity the first time to see how it feels. Experience a great workout and improve your energy management. Focuses on cardio strength and core. Heart pumping, air gasping drills intended to drench you in sweat and maximize your training time. Class has a proper warm-up, main routine and cool-down. The HIIT routine itself is very short (so you can be Powerful).

Book Waitlist

Nutrition Coaching (30m)

1 - 1:30pm

1:00pm - 1:30pm

Nutrition Coaching (30m)

Kristina Courage Book 0

Nutrition Coaching (30m)

Tuesday, December 02 · 1:00pm - 1:30pm

Instructors:

Kristina Courage

Book

Balletone Strength & Mobility

6 - 6:50pm

4 Participants

6:00pm - 6:50pm

Balletone Strength & Mobility

Kristina Courage Book 4/15

Balletone Strength & Mobility

Tuesday, December 02 · 6:00pm - 6:50pm

Instructors:

Kristina Courage

You need a 3' Foam Roller and up to two sets of Dumbbells (lighter & heavier). This workout will be drawn from Ballet, strength and mobility to improve muscle function, such as lengthening and strengthening. Improving your functional range of motion in your shoulders, hips, back and ankles. This unique class combines Ballet-type sequence (20 min), followed by 10-12 min of strength training and ending with 17 min rolling out on the Foam Roller.

Book Waitlist

Raymond Park Bootcamp

6:15 - 7am

4 Participants

Rick Grudzinski

6:15am - 7:00am

Raymond Park Bootcamp

Kristina Courage Book 4/20

Raymond Park Bootcamp

Wednesday, December 03 · 6:15am - 7:00am

Instructors:

Kristina Courage

Book Waitlist

Cardio Kickboxing Class

5:15 - 6pm

5 Participants

5:15pm - 6:00pm

Cardio Kickboxing Class

Kristina Courage Book 5/15

Cardio Kickboxing Class

Wednesday, December 03 · 5:15pm - 6:00pm

Instructors:

Kristina Courage

Punch and Kick your way to a fun moderate to high intensity cardio workout. Routine is based off kickboxing, boxing and other forms of martial arts. Build technique, control and speed through drills, combos and footwork. Shoes required.

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Core Strength & Stretch

6:15 - 7:05pm

7 Participants

6:15pm - 7:05pm

Core Strength & Stretch

Kristina Courage Book 7/15

Core Strength & Stretch

Thursday, December 04 · 6:15pm - 7:05pm

Instructors:

Kristina Courage

Total core integration circuit training workout. Using body weight and dumbbell weights and resistance bands. You will strengthen and lengthen the three dimensional core, consisting of your abs, obliques, transverse abdominis, pelvic floor muscles, rib cage, diaphragm, hips and shoulders. The last 10 minutes of class is self-assisted stretching with a band. This is a fun class that covers total body strength, core work and flexibility.

Book Waitlist

Raymond Park Bootcamp

6:15 - 7am

3 Participants

Rick Grudzinski

6:15am - 7:00am

Raymond Park Bootcamp

Kristina Courage Book 3/18

Raymond Park Bootcamp

Friday, December 05 · 6:15am - 7:00am

Instructors:

Kristina Courage

Book Waitlist

Bootcamp Class

9 - 10am

9 Participants

Lydia Thompson

9:00am - 10:00am

Bootcamp Class

Kristina Courage Book 9/15

Bootcamp Class

Saturday, December 06 · 9:00am - 10:00am

Instructors:

Kristina Courage

This Bootcamp workout is a mix of strength and cardio targeting the larger muscle systems. Fun drills and themes to torch fat, tone, and shape your butt and legs. The exercises are dynamic enough that they engage the core muscles (abs, lower back, obliques), as well. All levels welcome!

We often use some equipment. Like DB's, circle bands, or on rare occasion gliding discs.

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No sessions found

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Welcome to Grit Life Fit

Free Fitness & Nutrition Consultation

Thanks for contacting us!

7

17

Personal Training

Online Class Membership

Why Choose Grit Life Fit?

Trusted By Our Members

Frequently Asked Questions

How do I schedule Nutrition Coaching with you?

Why should you work with me?

Payment Policies

Raymond Park Bootcamp Scheduling

Schedule

Schedule

Raymond Park Bootcamp

Raymond Park Bootcamp

H.I.I.T. Class

H.I.I.T. Class

Nutrition Coaching (30m)

Nutrition Coaching (30m)

Balletone Strength & Mobility

Balletone Strength & Mobility

Raymond Park Bootcamp

Raymond Park Bootcamp

Cardio Kickboxing Class

Cardio Kickboxing Class

Core Strength & Stretch

Core Strength & Stretch

Raymond Park Bootcamp

Raymond Park Bootcamp

Bootcamp Class

Bootcamp Class

Book Session

Booking Confirmed

Added to waitlist

Booking Confirmed