Start Strength Training
Join the GET STRONG: 28-Day Challenge
Welcome to your new strength training plan - four weeks of guided workouts designed to help you build strength and consistency.
The GET STRONG: 28-Day Challenge works for every fitness level and removes the guesswork from strength training.
Free to join. No credit card needed.
Provide your email address and join the challenge.
JOIN THE CHALLENGE
Ready to Start Strength Training?
Start Here – You want to strength train, but don't know where to begin.
Built-In Variety – You need workouts that feel fresh, engaging, and realistic.
Stick to the Plan – You want flexibility and convenience, but also structure.
Build Real Strength – Follow a 28-day plan to get stronger and move better.
With the GET STRONG: 28-Day Challenge, you’ll follow a guided plan featuring the same workouts trusted by health clubs and YMCAs around the world.
Ready to Get Strong?
Build Strength and Move Better in 28 Days.
JOIN THE CHALLENGE
Get to Know MOSSA On Demand
MOSSA On Demand helps people build strength, move better, and stay consistent with workouts that fit real life.
With expert coaching, motivating music, and professionally designed programs, MOSSA helps make consistency easier.
Whether you are new to exercise, returning after a break, or looking for fresh motivation, MOSSA meets you where you are and helps you keep moving forward.
What Makes MOSSA On Demand Different:
12 Expert-Designed Programs –trusted by health clubs and YMCAs worldwide.
500+ Professionally Coached Workouts – refreshed worldwide each quarter (JAN, APR, JUL, OCT).
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 – designed to help you move and feel 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.
Plus, you’ll get access to the full MOSSA On Demand library during the challenge.
Why the GET STRONG Challenge Works
Build Full-Body Strength & Endurance
The challenge uses our flagship program, Group Power, combining classic strength training with functional movement to help you build strength and move better.
Accountability with Flexibility
Each week includes five days of guided workouts or recovery - structured enough to keep you on track, flexible enough to fit real 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 works best for you.
Steps to Move Better & Live Stronger
Enter your email address (no credit card required), and you're in.
For the full experience, you'll want a barbell and a step. Need equipment? Sign up for the challenge first – we'll send you a link to the MOSSA Store.
We'll send your 28-day plan plus tips to guide you through the challenge.
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 to help you better understand strength training and build healthy habits.
We'll guide you through every step with 10-minute, 30-minute, and 60-minute workouts, a technique video, and daily motivation.
What workouts will I do?
Your 28 days will include Group Power, our signature strength training program, plus Group Core, a functional workout focused on strength, stability, and mobility.
Workouts range from 30 to 60 minutes.
Some days also include walking, educational videos, or guided recovery sessions.
What equipment will I need?
For the full challenge experience, you’ll want an adjustable barbell and a step.
The adjustable barbell allows you to increase or decrease weight for different exercises and muscle groups.
The step acts as a workout bench and supports a variety of strength and mobility movements.
Don’t have a barbell? Dumbbells work too.
What recovery sessions will I do?
Your 4-week plan includes recovery sessions designed to help you feel better, move better, and stay ready for your next workout.
Throughout the challenge, you’ll also have access to Group Centergy and TLC Sessions led by physical therapist Dr. Lauren Polivka.
Do I need experience lifting weights?
No. These workouts are designed for all fitness levels — whether it’s your first or five-hundredth time picking up a barbell.
Is there a cost to the challenge?
No. The 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'd like to continue, you can start a 14-day free trial (credit card required).
Memberships continue at $24.99/month or $179.88/year ($14.99/month billed annually).
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 participants around the world.
How does the registration work?
Enter your email address — no credit card required — and we’ll send everything you need to get started.
Move Better. Feel Stronger. Build Consistency in 28 Days.
The GET STRONG: 28-Day Challenge is a simple, guided way to build strength, improve mobility, and create healthy habits that last.
Give yourself 4 weeks to move better, feel stronger, and build momentum — one workout at a time.
JOIN THE CHALLENGE