Max Size Get Jacked

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90-day training plan

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Max/Size is a high volume, high intensity, hardcore training program designed around the classic, old school lifts. Intended to force hardgainers into building muscle, Max/Size will also help seasoned athletes take their physiques to whole new levels and experience new gains. Whether you’re just starting out or have been in the iron game for years Max/Size sets the old rule books ablaze and delivers scorching results.


Hardgainer to Muscular

Hardgainers face many challenges when it comes to changing their bodies. From improper diet to bad advice from bro-scientists. Max/Size tosses all the old notions about muscle building into the flames and forges a new template for max growth, max development and max size. Regardless of what results you’ve experienced in the past, Max/Size is scientifically designed to shift your body into growth mode. Create a body forged in the flames with Max/Size!

From Built to Jacked

Whether you’re looking to burst through a training plateau or you just want to pack on a few pounds of muscle, experienced athletes will make all new progress using Max/Size’s scientific approach to hypertrophy. With a combination of progressive overload principles, intensity driven techniques and cycling phases of hyper-volume, Max/Size will have you tossing your old clothes into the flames as you watch those old PR’s go up in smoke!




Building muscle is all about pushing your body to the max. The workouts in Max/Size are designed to do just that but if it’s STILL not enough to blast your body into overdrive our 5-Alarm finishers will complete the job ensuring you have nothing left in the tank! Get ready for these incredible workout finishers available only with Max/Size.




Weeks 1-4


Weeks 5-8



Weeks 9-12




Building off of the incredible success of our ‘You in 10 min’ YouTube challenge we’ve cranked the temperature up to 100º to deliver a total body version of those punishing workouts that will cause even the most loyal Athlean-X followers to go up in smoke.


The Hot Plate Challenge delivers an old school athletic favorite in the form of a true functional fitness challenge. You may look like a superhero but if you can’t perform then all that muscle is worthless. The Hot Plate Challenge is the ultimate test of your ability to work in a real world scenario. Rise to the occasion or crumble on the field of battle.


See how high you can climb as the walls crumble around you. Each floor of the towering inferno turns up the heat on the training as your body begs you to stop, drop, and roll up into the fetal position. Forge ahead and earn a top score or give up and perish in the flames. The burn is only temporary but the glory will live on for an eternity!


x-factor extreme Meal Plan

If there’s anything we know at ATHLEAN-X, it’s how to turn skinny guys into muscle building machines and the X-Factor Meal plan has been the foundation of that plan since day 1. Our all new Extreme swap out meals will help hardgainers learn to eat right to build muscle while the classic X-Factor foundation plan will help veteran athletes continue to build muscle without adding any unwanted fat.

Meal Plan Includes

  • Newly updated Day-by-day meal plan & supplementation guide
  • Easy to follow meals that produce results!
  • Never count calories, or measure and STILL get shredded!
  • All new “Size” meals to get you jacked like never before!


I want you to be totally confident in training with ATHLEAN-X. That’s why we offer our Extra Mile Guarantee. For the complete 90 days, our team will answer questions, modify exercises and work to get you through the program. We take this very seriously and we’re not going to go easy on you or let you quit, we’re going to keep you focused and help you get the most out of your training!

If you commit to ATHLEAN-X, then we commit to you and your success!

Customer Reviews

Rated 4.8 out of 5
2348 customer reviews
5 STARS81%
4 STARS18%
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Bryan Blackburn
MAX/SIZE | Verified User
Rated 5 out of 5

Max Size Review

I have thoroughly enjoyed this program and the results from it. The variety of exercises and the intensity of the workouts pushes me every time and keeps it interesting. I would highly recommend Max Size to others.

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Matthew Simpson
MAX/SIZE | Verified User
Rated 5 out of 5

Great workout for more strength

I could definitely feel the difference in overall strength after just a few weeks of this program. It was nice to get some of the more classic lifts into the routine. It’s a fun one!

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Gabriel M
MAX/SIZE | Verified User
Rated 5 out of 5

Worth your money

This program really pushes you to your limits, I have noticeable gains and I feel stronger than ever. Now I will buy the shredding program! 100% recommend!

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MAX/SIZE | Verified User
Rated 5 out of 5


at first intimidated b/c of the sheer volume. after all said and done TOTALLY WORTH COMPLETING! Increased weights on all my lifts! Put on noticeable size! Will be completing this again!

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MAX/SIZE | Verified User
Rated 4 out of 5

Launch for gains

Great program with strategic and comprehensive approach for developing physique. Good lessons for using different methods. Pretty demanding also. Weeks 5-8 were exhausting for body, last 9-12 for mind. Gains guaranteed. I’m living very busy years and had short training pauses during this program, but still I progressed very much.

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MAX/SIZE | Verified User
Rated 5 out of 5

Solid Program

I used this program specifically to get back into weight lifting and muscle building after taking a few years off. I wasn’t really concerned about fat loss or cardio at the time, but with this program you definitely are getting a full body workout. It’s great for the beginner, as well as the experienced lifter looking for a change in routine that might have gone stale. I also enjoyed using the site to keep track of my notes for each workout. It keeps track of your prior workouts to ensure you are progressing. Overall, if you follow the program, do the workouts the way they are intended, you will see gains.

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Barrett Santi
MAX/SIZE | Verified User
Rated 4 out of 5

Grueling but good!

This program is no joke. I completed AX-1 and AX-2 prior to this, and I liked them but they weren’t as challenging as I expected. This program (Max Size) is exhausting, with most sets going to failure and some performing ISO holds after that. Just trusting Jeff and doing what he says to do (as I usually do), I got results. All in all I liked the program and would suggest for anyone wanting to try it that you ensure you have your nutrition dialed in and allocate ample time for rest/recovery because you’ll need it!

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Charles Ponce
MAX/SIZE | Verified User
Rated 5 out of 5

Max Size Works

I am a hard gainer. I have seen the best gains I have ever had and I am 63 years old with Max Size. Make sure you have your diet dialed in and get plenty of sleep because your going to need it to recover after each workout.

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Joshua Spencer
MAX/SIZE | Verified User
Rated 5 out of 5

Surprisingly well rounded and great results!

This program was very challenging for me. BLUF between this and MAD shred which I did first, I dropped 4″ off my waist and went from 16% bf to about 10%. Best of all I feel like I’ve gotten better at engaging shoulders and back muscles like I never have before. Don’t be intimidated, treat every workout like a practice session and you’ll be amazed at how much you learn. And my muscles, particularly chest/arms/shoulders are a lot more defined too. The 3 distinct phases were uniquely different but really flowed well together. Best of all, my conditioning is still decent. Give it a go!

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Isaac Huezo
MAX/SIZE | Verified User
Rated 5 out of 5

Real Gainer

Completing the Max size program felt so good. I was a beginner when I started this program but now I feel so good about myself. Cannot wait to see where I will go next… Athleanx keep the good work and continue delivering wonderful products.

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The program average 5 days per week with each workout clocking in between 10 minutes (for some intense conditioning work) to about 60 minutes (depending on your ability to withstand the finishers!)

Both Max/Shred and Max/Size will require equipment.  While there is a great deal of bodyweight training programmed, you will need the basics for a home gym such as some dumbbells, an adjustable bench, resistance band, pullup bar, and a barbell to complete the exercises as they are programmed.

That said, as with AX-1, exercise swaps can be made to overcome the lack of a barbell with dumbbell adaptations coming in as suitable replacements.

The Max/Size program is not designed to be fit into the existing AX-1 schedule or any other A-X workout, as it is a stand alone program with the perfect amount of volume included to achieve the goal of maximum fat loss without loss of strength or size.


There has been a dramatic shift in recent years towards heavier training being advocated for women. This is great! That said, in a rush to do so, poor programming has resulted in many women getting hurt and injured from the improper guidance on how to do that. Max/Size provides you with the safest, most structured approach to lifting heavier so you can add lean toned muscle without sacrificing femininity. The program can also be used in succession with Max/Shred to reap the benefits of both maximum fat loss and lean muscle development should you choose to do so.

The Max/Size and Max/Shred programs are not designed to be performed at the same time, as they are stand alone 12 week programs, allowing you to focus your effort on one goal at a time. That said, they were designed to build off of each other and work perfectly when done in succession!

Whether you want to focus on fat loss or lean muscle gain first, the other program will smoothly pick up where one leaves off allowing you to create your own physique over 24 weeks!

Max/Size is designed to do one thing better than any other program, build muscle.

That said, with it's strategies rooted in the science of muscle growth and ensuring the intensity in every workout is high enough to create it…Max/Size can help even the hardest of hard gainers to put on muscle. The importance of recovery is key, and often overlooked by those eager to pack on the gains. Not in Max/Size.

That is a term that is often relied on to place an artificial limit on what you can achieve with your physique. Most of the time, even the most seasoned of lifters find that they have another level of intensity that they simply have not tapped into (because it’s damn hard!).

Max/Size gives you no choice but to train in that realm…and in doing so, delivers results for anyone who dares tackle it!