Somebody I trained this spring set a timer for 45 seconds between every set of everything. Squats, rows, curls, all of it. He’d built the habit from an app three years earlier and never questioned it once. His squat had not moved in eight months.
We changed one thing. Rest went to three minutes on the heavy work. Six weeks later he added 100 pounds to his squats
Nothing else changed. Same program, same days, same food.
Rest is not a break, it’s part of the set
The phosphocreatine your muscles run on during a hard set of five is mostly gone by the time you rack the bar. It comes back on its own schedule, and that schedule doesn’t care about your timer. Roughly half of it returns in about 30 seconds. Getting most of the rest of it takes closer to three minutes.
So when you start set two at the 45-second mark, you’re not repeating set one. You’re doing a weaker, sloppier version of it with the same weight on the bar. Your form degrades, your bar speed drops, and the thing you were actually training, which is the ability to produce force, quietly stops being trained. What you’re training instead is fatigue tolerance. That’s a real quality. It’s just not the one most people think they’re buying when they walk into a gym.
I see this constantly with people who came to strength work from cardio. Resting feels lazy. Sitting on a bench doing nothing for three minutes while other people are moving feels like wasted gym time. It isn’t. It’s the part that makes the next set count.
The numbers I actually use
These aren’t laws. They’re where I start people, and then we adjust based on what happens on the second and third set.
- Heavy strength work, 1 to 5 reps: 3 to 5 minutes. Yes, really.
- Main compound lifts, 6 to 10 reps: 2 to 3 minutes.
- Accessory work, 10 to 15 reps: 60 to 90 seconds.
- Isolation work at the end, arms and calves and rear delts: 45 to 60 seconds is fine.
The simplest self-check I know: if you can’t hit at least the same number of reps on set two that you hit on set one, minus maybe one, you rested too little. If your reps are falling off a cliff by set three, that’s not toughness. That’s a rest problem wearing a discipline costume.
HIIT works the other way
Here’s where people get confused, because they hear “rest more” and apply it to everything.
In a HIIT block, the short rest is the entire point. The whole method depends on going back into the next interval before you’ve fully recovered, because that incomplete recovery is what drives the conditioning adaptation. Thirty seconds hard, thirty seconds easy. Forty on, twenty off. Those ratios are doing exactly what they’re supposed to do.
The mistake is running your strength work like a HIIT session, or running your HIIT like strength work. I’ve watched people turn a genuinely well-designed interval workout into a mediocre one by checking their phone for ninety seconds between rounds. And I’ve watched people turn a genuinely well-designed strength session into cardio by refusing to sit down.
Different tools. Different rest.
What to do with the time
Three minutes feels like forever at first. Don’t fill it with your phone, because you will look up and it will have been seven minutes and the session will run ninety minutes instead of sixty.
Walk. Breathe through your nose. Set up the next set. If your training partner is on the same bar, alternate, which is why I like pairing people in sessions when the schedule allows. On my own days I’ll use the longer rests between heavy sets to do a bit of easy hip or shoulder work, nothing that costs anything, just keeping the joints awake. That’s a piece I lifted straight out of yoga, and it’s part of why I’ve kept yoga in the week since I started coaching in Montreal in 2021.
One more thing. If you’re training in a busy gym at 6pm, three-minute rests are socially difficult. You will feel like you’re hogging the rack. Two options that both work: go at an off hour, or superset the heavy lift with something completely unrelated and low demand, like a light band pull-apart, so the rack turnover looks reasonable and your legs still get their full recovery.
Start with the strength sets this week. Set a real timer, sit down, and let it run out. Two or three sessions in you’ll notice the difference before the numbers do.
Training in Montreal or online and want the rest of the program to make as much sense as the rest periods, get in touch through the contact page.
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