If you're asking, "is my workout split not working," the answer is almost always no-the real problem is that you aren't applying progressive overload correctly. You're likely not hitting each muscle group with the 10-20 hard sets per week required for growth. You're showing up, you're sweating, and you're following a Push/Pull/Legs or Upper/Lower plan you found online, but nothing is changing. The weights on the bar are stuck, and the person in the mirror looks the same as they did two months ago. It’s frustrating, and it makes you question the entire plan. But the split itself-the way you organize your training days-is just a container. What matters is what you put inside it: measurable, consistent progress. Any popular split can work if you apply the right principles, and any split will fail if you don't. The reason you're stuck has nothing to do with the *name* of your split and everything to do with the math behind your workouts.
Progressive overload is the fundamental law of getting stronger and building muscle. It means doing more work over time. That’s it. More weight, more reps, or more sets. If your numbers aren't going up over weeks and months, you are not building muscle. The single biggest mistake people make is confusing effort with progress. You can have the hardest, most grueling workout of your life, but if you lift the exact same weight for the exact same reps next week, you haven't progressed. You just got tired. Your body has no reason to adapt and grow bigger or stronger because you haven't given it a new challenge to overcome. Think about it with simple math. If you bench press 155 pounds for 3 sets of 8 reps, your total volume for that exercise is 3,720 pounds (155 x 24). If four weeks later you're still benching 155 for 3x8, your volume is still 3,720 pounds. You are physically stuck. But if in those four weeks you get to 160 pounds for 3x8, your volume is now 3,840 pounds. That small 5-pound jump is the signal your body needs to grow. That is progressive overload. That is the only thing that works. You know the principle now: do more over time. But be honest with yourself for a second. What did you squat for how many reps, four weeks ago? Not a guess, the exact number. If you can't answer that in three seconds, you're not applying progressive overload. You're just exercising.
Instead of throwing out your entire routine, perform this three-step audit. This will identify the real bottleneck in your training and give you a clear path to start making progress again. This works whether you're on a PPL, Upper/Lower, or even a Full Body split.
Volume is the primary driver of muscle growth. The target for most people is between 10-20 hard sets per muscle group, spread across the entire week. A "hard set" is one where you finish with only 1-3 reps left in the tank. You couldn't have done 5 more reps. Now, audit your current split. Let's say you're training your chest on a Push/Pull/Legs split once per week:
This is the problem. Six sets is maintenance volume at best. It’s not enough stimulus to signal new growth. You need to add more work.
Now you're in the 10-20 set sweet spot. You've nearly doubled your growth stimulus without changing your split at all.
Frequency is how often you train a muscle group. For building muscle, hitting each muscle group 2 times per week is significantly more effective than only once per week. This allows for more quality volume and provides two growth signals instead of one. Let's see how different splits stack up:
If your split only has you training each muscle once a week, this is a major reason you've stalled. The easiest fix is to switch to an Upper/Lower split. It's simple, effective, and guarantees you hit the optimal 2x frequency.
This is how you ensure progressive overload happens automatically. Don't just go into the gym and "lift heavy." Follow a system. The simplest and most effective system is called Double Progression.
Here’s how it works. For each exercise, you set a rep range, for example, 8-12 reps.
Here's what it looks like for a Lat Pulldown with a goal of 3 sets of 8-12 reps:
This system removes all guesswork. You have a clear target every single workout: beat last week's numbers.
If you implement the 3-step audit, your experience in the gym will change. Forget the "no pain, no gain" mindset. Progress is about precision, not pain. Here is a realistic timeline of what to expect.
Weeks 1-2: It Will Feel Different (and Maybe Easier)
Your first couple of weeks will be about establishing a baseline. You're focusing on perfect form and hitting your target reps, not annihilating your muscles. You'll likely leave the gym feeling strong and energized, not completely destroyed. This is a good sign. It means you can recover and come back stronger for your next session. You might feel a new kind of muscle soreness (DOMS) from the increased frequency, which is also normal.
Month 1 (Weeks 3-4): The Logbook Becomes Your Proof
You won't see dramatic changes in the mirror yet. This is where most people quit because they lack patience. Your source of truth is not the mirror; it's your workout log. You should clearly see that you are adding a rep here, a rep there, across your main lifts. The 155-pound bench press from week 1 is now 160 pounds. That is the only proof you need that the plan is working.
Month 2 (Weeks 5-8): You Start to See and Feel the Change
This is where the magic happens. The consistent, small improvements in your logbook begin to compound into visible results. The weights that felt challenging a month ago now feel like your warm-up sets. Your shirts might feel a little tighter around the shoulders and arms. A realistic rate of muscle gain for someone who is no longer a beginner is about 0.5 to 1 pound per month. It's a slow process, but by the end of 60 days, you will have undeniable proof-both in your logbook and in the mirror-that your workout is finally working.
Almost never. As long as you are making progress by adding weight or reps over time, do not change your split or your exercises. The only reasons to change are if your life schedule changes or you have genuinely stalled for 4+ weeks after trying all other methods of progression.
It's not "bad," but it is suboptimal for 90% of people who don't use performance-enhancing drugs. Hitting a muscle only once a week provides a weaker signal for growth compared to hitting it twice. An Upper/Lower or PPL split will deliver faster and more consistent results for most lifters.
Adding weight is just one form of progressive overload. If you're stuck, you can add reps with the same weight, add an extra set to the exercise, or reduce your rest time between sets. The goal is simply to make the workout harder than it was last time.
No, and you shouldn't. Training 1-2 reps shy of failure provides nearly all of the muscle-building benefits with far less fatigue. This allows you to recover properly between sessions and perform more high-quality work throughout the week, leading to better long-term gains.
Key signs of poor recovery include a persistent lack of motivation to train, muscle soreness that lasts for more than 72 hours, and a consistent inability to beat your previous workout numbers. If you experience these, prioritize getting 7-9 hours of sleep and eating enough calories and protein.
All content and media on Mofilo is created and published for informational purposes only. It is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition, including but not limited to eating disorders, nutritional deficiencies, injuries, or any other health concerns. If you think you may have a medical emergency or are experiencing symptoms of any health condition, call your doctor or emergency services immediately.