Every gym has two types of lifters when it comes to warming up: the ones who load 225 onto the bar cold and wonder why their shoulder is barking, and the ones who spend 20 minutes and six plate changes “warming up” before they have done a single working set. Neither one is doing it right, and almost nobody has ever been taught an actual system for how many warm-up sets a given lift needs and how heavy those sets should be. It is not complicated once you see the logic behind it, and it is one of the fastest fixes I make with new clients. The answer to how many warm up sets you need depends on three things: the load you’re moving, the movement pattern, and your current readiness state. Get those three variables right, and you’ll know exactly how many warm-up sets to do every single time.
The Logic Behind Warm-Up Sets
I need to start here because most lifters skip this part and just copy someone else’s routine. A warm-up set has one job: prepare your nervous system, joints, and connective tissue for the load and movement pattern you’re about to expose them to. That’s it. It is not a mini workout. It is not cardio. It is preparation.
When I watch someone lift, the ones who struggle most are the ones treating warm-up sets like they don’t matter, or worse, treating them like a second working session. Your warm-up should be short, graduated, and intentional. Each set should tell your body: “Hey, something heavier is coming. Get ready.”
The key principle is load progression. You start light, move the bar with intention and good form, and increase the load in rational increments until you reach your working weight. How many sets that takes depends on how heavy your working weight is relative to your baseline strength. A 135-pound bench press needs fewer warm-up sets than a 315-pound one. That is just biomechanics and neurological readiness.
The Percentage-Based System That Actually Works
Here is the system I teach every new client, and it works regardless of what lift you’re doing or what your actual numbers are.
Start by identifying your working weight—the load and rep range you’re actually training. Let’s say you’re benching 225 for 5 reps. That’s your target.
Now work backwards in jumps that feel small enough to move smoothly but big enough to matter. Here’s my protocol:
- Set 1: 50% of working weight, 5 reps. Just get the bar moving. Feel the groove.
- Set 2: 70% of working weight, 3 reps. Add some weight, stay for a short set.
- Set 3: 85% of working weight, 2 reps. Now you’re getting heavy. Stay tight.
- Set 4 (optional): 95% of working weight, 1 rep. Only if your working weight is above 300 pounds or you’re feeling particularly stiff that day.
For that 225-pound bench press working set, you’re looking at: 115 × 5, 160 × 3, 190 × 2. Done. Three warm-up sets. Total of 10 reps before you hit your working sets. You’ve activated your nervous system, lubricated your joints, and grooved the movement pattern without fatiguing yourself.
This system scales perfectly. If your working weight is 275 for 5, your warm-ups are: 140 × 5, 190 × 3, 235 × 2, 260 × 1. Four sets. If your working weight is 155 for 5, your warm-ups are: 80 × 5, 110 × 3, 130 × 2. Three sets, and you’re done.
When You Need More—Or Fewer—Warm-Up Sets
The percentage system is your baseline, but reality is messier than percentages. You need to adjust based on the actual conditions you’re in.
When to Add Extra Warm-Up Sets
I add warm-up sets when I see lifters who are genuinely stiff or dealing with a previous injury. If your shoulder has been bothering you, three warm-up sets for the bench press might not be enough. I’ll add a fourth at 70% just to get more reps of shoulder mobilization and activation in before the load gets heavy. Same logic applies if you’re warming up after a desk job or a long car ride—your tissues need more prep time.
I also add an extra set if the movement pattern is technically complex. A high-bar back squat requires more nervous system prep than a leg press. If you’re learning a new lift—a first-time deadlifter, for example—I’m doing five warm-up sets minimum, even at lighter weights, because I want perfect rep quality before the load accumulates.
Cold conditions matter too. Training in a chilly gym in January? Add a set. Your muscles and connective tissue are stiffer and need more time to prepare.
When You’re Overdoing It
I see this constantly with new lifters: they do five or six warm-up sets, accumulate 40 reps before they hit their working sets, and then wonder why they feel flat when it’s time to actually lift heavy. That’s fatigue, not preparation. Your muscles are tired, your nervous system is spent, and you’ve burned through glycogen you needed for the actual work.
If your working weight is 155 pounds or lighter, you probably only need two warm-up sets. Hit a 75-rep set of just the bar or light dumbbells, then go straight to your working weight. Your body doesn’t need the same amount of preparation for lighter loads. The system scales down the same way it scales up.
When You’re Doing Multiple Lifts in One Session
Here’s where people go wrong: they warm up the same way for their second heavy lift as they did for their first. Mistake. After a full session of benching, your chest, shoulders, and triceps are already primed. Your body temperature is elevated. Your nervous system is awake. You don’t need the same warm-up protocol for an incline press after benching that you would if incline was your first lift of the day.
What I do: after the main lift, I do one or two lighter warm-up sets for the second lift—just enough to pattern the movement and remind the nervous system of the load. Usually 50% and 70%. That’s it. You’ve already paid the warm-up tax.
The Real Diagnostic: Are You Moving Well?
Everything I’ve outlined gives you a framework, but here’s the actual test: Can you move well at your working weight? If you’re hitting your final warm-up set and something doesn’t feel right—the bar is slow, your form is breaking, your joints are tweaky—you do one more set. Maybe at 90% instead of jumping straight to 100%. Your warm-up should end when you feel prepared, not when you’ve hit a magic number.
Conversely, if you hit your second warm-up set and you feel completely ready to go, you don’t need to do a third. Listen to the feedback. A good warm-up feels smooth and confident, not rushed or exhausting.
Your Protocol Going Forward
Here’s what I want you to do: take the percentage system I outlined—50%, 70%, 85%, and optionally 95%—and apply it to your next session. Count how many total warm-up sets you need. Pay attention to how you feel in the working sets. Are you sharp and ready? Are you moving fast? Did you have enough warm-up, or did you have too much?
Then adjust. Add a set if you felt unprepared. Cut a set if you felt flat. Most lifters land on three to four warm-up sets per main lift, and that becomes their baseline. From there, you only adjust for the factors I mentioned—stiffness, cold, new lifts, or multiple heavy lifts in one day.
Stop guessing. Stop loading 225 cold and hoping your body adapts. Stop spending 20 minutes on prep work. Use the system, trust the process, and you’ll spend exactly the amount of time warming up that your lift requires—no more, no less.
No products were recommended in this post, so do NOT add an affiliate disclosure — it would be inaccurate.
Written by Jordan Ellis
Jordan Ellis is a personal trainer with over eight years of experience helping everyday people get stronger and move better. He focuses on home fitness: effective training spaces, equipment that earns its price, and programs that work in a spare room or basement, not just a commercial gym.
