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Weight Loss Challenge

April weigh-ins have been postponed until June 1-5, 2020 due to coronavirus (COVID-19) concerns. See the documents linked below.
  • Venue & Location

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    Weigh-in Locations Vary
    See Below
  • Fee & Registration

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    $35.00 – $65.00, Registration Required


The St. Luke's Weight Loss Challenge is designed to help you achieve a healthy weight and an active lifestyle. The goal is to lose 3% of your total body weight within 180 days, and 5% by the final weigh-in. Those who meet all the requirements (weigh-ins and weight loss) will equally split the $10,000 prize money!

After your registration is complete, you'll receive:

  • A chance to earn part of the $10,000 prize money for losing a minimum of 5% of your total body weight.
  • An online toolkit with meal ideas and shopping lists
  • Weekly health tips and recipes
  • Quarterly cooking classes and demonstrations
  • "Ask the Expert" sessions, featuring engaging speakers highlighting the dimensions of well-being (physical, social, emotional, occupational/financial, environmental, and spiritual)
  • Monthly prizes for participating and persevering
  • Social support and connection

Download the official rules and information.


Registration Instructions

Registration opens September 29, 2019.

  • $59 for early registration (September 29-October 26)
  • $65 for general registration (October 27-November 1)
  • $35 for late registration (November 2 and later)
    • Participants who register after November 2, 2019 will receive all the benefits of the program but will not qualify to compete for the prize money.

You must also submit a W9 by 5 p.m., September 18, 2020, to receive prize money.

Register Online

Special Instructions


Attend all the required weigh-ins to qualify for the prize money. If you miss any of the weigh-ins, you'll still be in the challenge and will continue to receive health tips, attend classes and programs, and can win perseverance prizes, but you'll no longer be eligible for the prize money.

Weigh-in Dates and Goals:

  • Initial: October 28-November 1, 2019
  • 90-days: January 13-17, 2020
    • You must maintain weight over the holidays, within two pounds of initial weigh-in.
  • 180-days: April 13-17, 2020 Moved to June 1-5, 2020
    • 3% body weight lost
  • Final: September 14-18, 2020
    • 5% body weight lost

Weigh-in Sites:

Weight Loss Challenge FAQs

Click each question below for its answer:

How are the winners determined?

Winners are determined by the percent of body weight lost – NOT the number of pounds lost. 
Here’s how you figure it out:

  • Take the Number of pounds lost (ex. 10 lbs)
  • Divide by the STARTING WEIGHT (ex. 10 lbs divided by 200 = .05)
Multiply by 100 (ex. .05 x 100 = 5%)
How often do I need to weigh-in?

There are FOUR weigh-ins for the 2019/2020 program.

  • Initial: October 28-November 1, 2019
  • 90-Day: January 13-17, 2020 (must maintain weight over the holidays – within 2 pounds of initial weight)
  • 180-Day: April 13-17, 2020 (3% body weight lost by 180-day weigh-in)
  • Final: September 14-18, 2020 (5% body weight lost by final weigh-in)

In order to compete for prize money, you must attend EACH weigh-in at one of the official weigh-in sites.

How do I earn a FREE entry into the FitOne 5k in September 2020?

Attend the first three weigh-ins (first weigh-in in October; 90-day in January; and 180-day in April) and lose 3% of your bodyweight by the 180-day weigh-in, you will earn a free entry into the FitOne 5k walk/run in September 2020! 

*Free entry is non-transferable; must register for FitOne by Sept 1, 2020.

What should I wear when I weigh in?

Please wear a t-shirt and shorts/capris/sweats. Jeans/heavy clothing are discouraged. It will be marked on your weigh-in form and you will be expected to wear similar clothing at your final weigh-in. 

What if I miss a weigh-in?

You will still be in the Challenge, but you will be ineligible to win prize money.  You will continue to receive health-tips, and you can attend any of the classes and programs.  It’s the ONE and ONLY rule that keeps you in the running for prize money so please plan accordingly.  Don’t wait until the last day to weigh-in.

When is the final celebration?

We will celebrate all of your success on Wednesday, September 30, 6:00pm – location TBD in Twin Falls and Boise/Meridian.

Do I have to attend the finale?

No, but you are encouraged and invited to attend this fun celebration! 

Do I have to register online?

Yes, it’s the ONLY registration option as it helps ensure the accuracy of your information. 

Register Now

What happens after I’m registered?

You need to get your first OFFICIAL WEIGHTPlease visit the weigh-in sites for days/times they are open!

Can I get my money back?

Please read all of the requirements and rules of the Challenge prior to registering as all registrations are NON-REFUNDABLE and non-transferable to next year’s event, NO exceptions. This policy stays in effect whether you are injured, have an unexpected business or family emergency, pregnancy, etc.  There are NO exceptions.

Can I participate if I have had bariatric surgery?


Can I participate if I am pregnant?

Unfortunately, pregnant women are not allowed to participate for prize money. 

Can I still participate and win if I’m an employee of St. Luke’s?

YES! Only those of us who directly organize and promote the Challenge are unable to compete for prize money. So sign up and start creating a healthier YOU! 

Can I form a team?

We encourage you to gather friends and family and create a team for social support! However, there is no prize money for a team category.