Why Some Gym Machines Feel Heavier Than Others

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Have you ever switched gyms and tried to do your usual workout, only to find that the machines are a lot harder—or maybe a lot easier? Before you start questioning your strength or your training, you need to know something: you can’t trust the numbers on the weight stack, and you shouldn’t expect them to match from gym to gym or even machine to machine. 

What do the numbers on the weight stacks mean? 

When you’re looking at a cable machine, or any type of strength training machine with a stack of rectangular weights, there is probably a little sticker on each plate with a number. 

Sometimes those numbers are in pounds, and they represent the weight of the plate itself. If you were to take the 10 pound plate off the machine and weigh it, it would weigh 10 pounds. (Probably.) Sometimes they are in kilograms. If it doesn’t say which, there’s no easy way to know for sure. It also doesn’t really matter, for reasons I’ll explain below.

And sometimes, plate stacks aren’t labeled with weights at all. You just know that if you’re strong enough to work with the plate labeled “5”, you’re stronger than if you could only use the machine at the “4” setting. How many pounds are you lifting? It’s not telling, and to be honest it doesn’t matter.

Pulleys and levers change how heavy the weight feels 

Even when the numbers on the machine are accurate, they’re not really helpful. Let’s say there’s a cable stack where each plate is 10 pounds, and you can use 5 plates for a certain exercise. You are moving 50 pounds of iron. 

But are you really applying 50 pounds of force to move that iron? Not necessarily. As you may or may not remember from your school days, pulleys and levers can make it easier or harder to move a weight. If you’re doing a cable crossover on a LifeFitness Signature Series Dual Adjustable Pulley machine, the one below, you’re getting a 4:1 mechanical advantage. When you put the pin in the stack where it says 52.5 pounds, you may be lifting 52.5 pounds but you only need about 13 pounds of force to do that.

Cable machines are simple enough that a company can publish their ratio, like LifeFitness did. (For some more examples: Rep’s Athena pulley system has a 2:1 ratio, so that 20 pounds feels like 10 pounds, whereas their lat pulldown has a 1:1 ratio, so 10 pounds feels like 10 pounds.)

But when it comes to other types of machines, there may not be a simple answer. A given gym contraption may have a combination of pulleys, levers, and other devices, and they may provide different amounts of assistance depending on how you adjust the machine or what exercises you are doing. 

Machines have different designs (and maintenance schedules)

With all of that in mind, you now know that the weight you feel like you’re moving is different from the weight labeled on the stack. But what does that tell us about comparing one machine to another? 

Machines can have different designs, especially if they are different models or come from different manufacturers. One gym might have a 4:1 cable machine, while another might have a similar machine with a 2:1 ratio. One gym’s leg press might be a horizontal style with a weight stack, while another is an angled leg press that you load with plates from the free weight section. You shouldn’t expect 200 pounds on one to feel like 200 pounds on the other. 

Even when two gyms have the exact same make and model of machine, one may be harder to move than the other. Maybe Gym A has an older machine that’s built up some rust, while Gym B has a newer model that was just oiled yesterday. 

How to track your progress when you train on different machines

Now that we know that every machine is different, and the labels don’t necessarily mean what they say, how are you supposed to handle that? 

Unfortunately, there’s no simple solution. If you alternate between two gyms, your best bet is to keep notes separately for each one. In your notebook or your strength training app, just track “leg press Planet Fitness” as separate from “leg press Crunch.” (Most apps will let you duplicate and edit the exercise entries.) 

If you drop into a variety of mystery gyms—maybe you travel a lot—try programming your workouts by RPE. Instead of doing four sets of 12 reps of 70 pounds, think of it as four sets of 12 reps at an 8-out-of-10 difficulty. That might be 70 pounds on the stack at one gym, 65 at another, and 72.5 at a third, but it doesn’t matter. You’ll still be getting a good workout at all three.

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