Welcome to CORE! This is your opportunity to be part of a community of like-minded people AND to take your body and health to the next level. Join us for this 8-week journey and create the life that you are meant to live!



The Core Challenge is an 8-week transformation that is supportive in nature. It’s about making your body and mind a better version of what it is today. When you

register below, you take step 1 toward a sexier you! Whether your goal is to lose weight, build muscle, or simply look and feel better, the CORE Challenge will give you the tools necessary to succeed.

Join Mark Macdonald—New York Times best-selling author, international fitness and nutrition expert, and TV personality—as he takes you through the challenge (step-by-step and week-by-week) with webinars, coaching tips, and world-class motivation. Then, connect with others on our Facebook group—CORE Challenge Community—for accountability, support, recipes, and fun photos.

There will be winners—CORE Champions—and this will provide the competition that some people need to push them through the journey. The team atmosphere, however, becomes the most unique aspect of this challenge, especially when you recognize that we can achieve more—and have more fun along the way—as a team. Go for it!

Step 1- Register
Register Now
  • First Name*
  • Last Name*
  • Email*
  • I am*
  • My age group is*
    Under 25
    45 +
  • I work in the health care industry*
  • My primary goal in the next 8 weeks is to*
    Lose Weight
    Build Muscle
    Look & Feel Better
  • * If you are only interested in completing the having the CORE experience and do not wish to be considered for one of the Champion Incentives, please select N/A below.
  • Do you agree to upload your before and after pictures to the Facebook community page—CORE Challenge Community (including your name, height, weight, goal(s), #corebeforepics / #coreafterpics)?*
  • Do you agree to email your body measurements and written/video backstory to corechallenge@mynt.com?*
  • Do you give permission for the photos, videos, posts and stories that you submit to be shared and/or used in promotional material (including our company website)?*
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Step 2- Buy your products

In order to complete the 8 week challenge, you will need the following products:

  • CORE Protein Shake (Chocolate or Vanilla) – 4 bags
  • CORE Boost CLEANSE – 1 box
  • CORE Boost BURN – 2 boxes
  • CORE Boost PRO-BIO – 2 boxes
  • If your challenge goal is to build lean muscle, add CORE Boost BUILD – 2 boxes
Buy the CORE Challenge Kit and SAVE $85.*BUY NOW


* If your goal is to build muscle, add (1) additional box of CORE Boost BUILD to your order.

Step 3- Join our Facebook page

Check us out at CORE Challenge Community & request to join the group. Once you register above, we will grant you access to add pictures, create posts, etc.

Join our Facebook Page

Step 4-Download your copy of the Week 1 Detox Phase

US Canada

Step 5-Download your copy of the Week 2 Ignite Phase

US Canada

Step 6- Watch the webinars

Hosted by Mark Macdonald, these webinars will give you the motivation, the mindset, and some essential tips to help you make the most of the CORE Challenge.

Watch Week 1 Watch Week 2 Watch Week 3 Watch Week 4 Watch Week 5 Watch Week 6 Watch Week 7 Watch Week 8

Step 7- Take your photos and upload to Facebook

Mary Smith
5’ 6”
160 lbs.
Goal: to lose 20 lbs. and tone up

Take TWO good-quality pictures (one shot from the front and one from the side) and post them to the CORE Challenge Community Facebook Page. Make sure that you are wearing a bathing suit or form-fitting clothing in your pictures, so that we can adequately judge your “starting point.” When you upload your pictures you will need to include the following information: your first and last name, your height, your current weight, and what your goal is. Submit these items along with the hashtag #corebeforepics so we can easily identify the photos we receive.

If you do not submit your before pictures, you may still take part in the CORE experience. You will not be considered for one of the Champion Incentives.


Step 8-Email your measurements & written/video backstory

Biceps (at biggest part)
Belly (largest circumference point)
Hips (across hip bone)
Butt (largest circumference point)
Thighs (at biggest point)

Then tell us your story (via a written email or video submission—we prefer the latter). Tell us why you want to take part in the challenge, what your goals are, etc.

Step 9-Take your after photos and email your after measurements


Just like step 7 and 8, but this time showing off your results.

Step 10-Download your copy of the Week 9+ Thrive Phase

US and Canada