Start Strength Training
Join the GET STRONG: 28-Day Challenge
Welcome to your new strength training plan - four flexible weeks of press-play workouts, motivation, and education.
The GET STRONG: 28-Day Challenge fits anyone, new to expert, and removes the guesswork from strength training.
It's FREE. $0 and no credit card needed.
Provide your email address to join the challenge. Then check your email for a special link!
JOIN THE CHALLENGE
Ready to Kickstart Your Strength Training?
Start Here – You know you need strength training, but don't know where to begin.
Built-In Variety – You're bored with your current workouts and need something fresh.
Stick to the Plan – You want convenience and flexibility...but you also want structure.
Get Results – You're ready to commit to a 28-day plan that builds real strength.
Don’t go at it alone! With the GET STRONG: 28-Day Challenge, you’ll follow a proven plan featuring the same workouts people love in health clubs, YMCAs, and around the world. You'll move with motivation, learn from experts, and build a habit that sticks.
Ready to Get Strong?
Get Muscle and Movement Strong in 28 Days.
JOIN THE CHALLENGE
Get to Know MOSSA On Demand
MOSSA On Demand is a streaming fitness platform designed to help people build strength, endurance, and confidence. With professional coaching, energizing music, and a variety of programs, it helps anyone create a workout routine that actually sticks.
Whether you are new to movement, returning after a break, or looking for fresh fitness motivation, MOSSA meets you where you are and keeps you moving and improving.
What Makes MOSSA On Demand Different:
12 Expert-Designed Programs – powered by the same team trusted by health clubs and YMCAs worldwide.
500+ Professionally Coached Workouts – refreshed quarterly across MOSSA's worldwide network
All Formats, All Levels – strength, cardio, mind-body, HIIT, cycling, dance, mobility, and recovery.
Flexible Durations – 10-, 30-, and 60-minute options for every schedule.
Guided Recovery & Mobility Sessions – move better, feel better, live better.
Monthly Planners & Weekly Challenges – built-in structure and motivation.
A Real Community – members connect, support, and celebrate progress together.
When you join the GET STRONG: 28-Day Challenge, we guide you every step of the way.
And as a bonus, we'll unlock our full library so you can explore everything MOSSA On Demand offers.
Why the GET STRONG Challenge Works
Build Full-Body Strength & Endurance
The challenge teaches you how to strength train using our flagship program, Group Power, a mix of classic lifts and three-dimensional, functional movements that build muscle, resilience, stamina.
Get Accountability with Flexibility
Each week features five days of guided workouts or recovery - structured enough to keep you on track, flexible enough to fit your life.
Perfect for Every Fitness Level
New to strength training or ready to level up? Adjust your weights, follow modifications, and choose the intensity that's right for you.
Steps to Move Better & Live Stronger
Enter your email address (no credit card required), and we'll send you a special link with access to all the GET STRONG content.
You'll need a barbell and a step, like the equipment shown on this page. If you need to purchase them, sign up for the challenge first - we'll send you a coupon code for the MOSSA Store.
After you register, we'll email your 28-day plan plus helpful tips to guide you through the journey.
What People Are Saying
“MOSSA has enabled me to maintain my workout routine in a flexible and safe way that are necessary for my mental and physical well-being.”
Jennifer V.
via Email
“It's great to have 10-minute or 30-minute online classes to choose from since I'm usually fitting in my workout in my home office space.”
Amanda O.
via Email
"I love that I can be a positive role model for my kids and be a witness that you can keep moving no matter where you are physically or mentally."
Kara H.
Facebook Review
Frequently Asked Questions
How does the 28-Day Challenge work?
The challenge includes 4 weeks, each with 5 days of workouts or recovery sessions.
You'll also receive educational videos ot help you understand strength training and build healthy habits.
We'll guide you through every step of the process - including 10-minute, 30-minute, and 60-minute workouts, a barbell technique video, and daily motivation!
What workouts will I do?
Your 28 days will include Group Power, our signature strength training program, and also Group Core, a functional strength, stability, and mobility workout. Some workouts are 30 minutes and some are 60.
Some days, though, you’ll have options to take a walk, watch educational videos, or enjoy guided recovery.
What equipment will I need?
For the challenge, you'll need an adjustable barbell and step.
The adjustable barbell allows you to vary weights for different major muscle groups (we'll talk more about that in your Day 1 welcome videos). And with additional plates available, can increase weight to 120 lbs.
The step is used as our workout bench and adds challenges for various work - lunges, more leg work, dynamic push-ups, even core work.
Trust us. It's worth the investment.
P/S - If you don't have an adjustable barbell, you can use dumbbells.
What recovery sessions will I do?
We've organized your 4 weeks to include recovery sessions to make sure you feel great and are ready for your next workout.
Throughout the 28-Day Challenge, you'll have options to experience our mind-body program Group Centergy (10 minute and 30 minute options) as well as our TLC Sessions, led by Physical Therapist, Dr. Lauren Polivka.
Do I need experience lifting weights?
No, these workouts are for all fitness levels, whether this is the first or five-hundredth time you’ve picked up a barbell.
Is there a cost to the challenge?
No. The entire GET STRONG: 28-Day Challenge is completely free.
Your free access to MOSSA On Demand lasts for the full 28 days.
What happens after the challenge?
When the 28 days end, your free access expires.
If you want to continue, you can start a 14-day free trial (credit card required).
Subscriptions are $14.99 per month (billed annually) or $24.99 per month (monthly).
Can I get extra coaching?
Yes! You'll gain access to a special challenge channel in our in-app Community where you can ask questions, share wins, and connect with MOSSA team members and other subscribers around the globe.
How does the registration work?
Just enter your email address - no credit card needed - and we'll email you the link to get started.
Move Better. Feel Stronger. Get Results in 28 Days.
The Get Strong 28-Day Challenge is your introduction, re-introduction, or reinvigoration of strength training! Give yourself 4 weeks, and you'll build more than muscle - you’ll build confidence, balance, mobility, and a new healthy habit.
JOIN THE CHALLENGE