Should you train when you're sick?

You’re on a roll with your training and diet. You are seeing some progress with the momentumyou’ve built. 

Then life decides to flip you a big fat middle finger.

You wake up feeling like a truck hit you, throat scratchy, nose running like Singapore’s Shanti Pereira, and the first thought in your head isn't "I should rest"... it's "but but but…I have leg day today."

I get it! You don't want to lose your gains, and skipping a session feels like admitting defeat. But here's the thing: training through sickness is one of the most common ways people accidentally sabotage weeks and weeks of hard work. So let's talk about what actually makes sense here, because "just push through it" is genuinely shitty advice.

The neck check

This one's simple: 

Symptoms above the neck (runny nose, sneezing, mild sore throat, that generally "ugh" feeling): light to moderate training is usually fine. Go easy, listen to your body, maybe skip the heavy singles.

Symptoms below the neck (fever, chest congestion, body aches, tummy issues, etc): hard NO.

Rest. This isn't the day for your program, no matter how disciplined you feel.

Here's a useful signal if you're not sure which camp you're in: when you're actually sick, your heart rate runs unusually high relative to your effort. You'll notice you're huffing and puffing at a pace or a weight that shouldn't feel that hard. That mismatch between perceived effort and heart rate is basically your body waving a red flag. Once they line back up again, that's when you know you're actually on the mend, not just symptom-free for the day.

"But I don't want to lose my progress"

It’s a legit worry. But here's the mental shift that actually helps: once you're sick, getting healthy again is the priority, not preserving your bench numbers. Half-training when you're ill just tends to keep you half-sick for longer, which delays you getting back to full training even more. It's a worse trade than just taking the days off. 1 step forward. 3 steps back.

Either commit to the rest, or commit to the session. Half-measures here don't serve you.

Coming back is its own thing

This is the part people mess up the most, and it's worth slowing down on. 

There's a real difference between "I missed a week of training" and "I was sick for a week." They are NOT the same thing recovery-wise. Illness puts a very real toll on your body beyond just detraining, and that toll doesn't disappear the moment your symptoms clear up.

A common trap: symptoms are gone, you feel "normal," so you head back in and do a modest deload (say, 5% off the bar, cut your volume a bit) assuming that'll cover it. Then you get under the bar and it feels like someone swapped your weight plates for the weight of the psychological trauma caused by an ex. You can barely finish sets you were repping out easily two weeks ago. Sound dramatic? It's happened to plenty of experienced lifters, and it happens because the body is still recovering from a debt caused by actually being sick, not just from missing sessions. 

A good rule of thumb from the endurance world (and it holds up for lifting too): For every day you were GENUINELY sick, give yourself roughly one easy day once you're back. I say genuinely because I know a lot of you tell me that you have to skip training from being sick, but your social media just shows a late night out - I’m watching you.  

Ease back in with reduced intensity AND reduced volume, not just one or the other, and expect that first week back to feel humbling. That's normal. It's not you losing your gains, it's your body finishing the job of getting well.

For those of you training at the PIT, you can also use the sets and numbers that you would use in a de-load week on your PIT App that Miles Henson created.

What about food?

Your recovery needs go UP when you're sick, not down, so this is not the week to be cutting corners on food or sleep.

A few things worth keeping in mind:

● Don't force a deficit. Appetite often drops when you're unwell, and combined with reduced daily movement, that can create an unintentional calorie deficit on top of everything your immune system is already dealing with. This isn't the moment to "make the most of it" and lean out. Eat enough.

● Keep protein reasonably consistent. Your body is doing repair work, immune and otherwise, and adequate protein supports that. You don't need to overthink timing or hit exact numbers to the gram, just don't let intake crash. On the other end of the spectrum, don’t just go “fuggit, I’m not training anyway, I’ll rest and eat pizza in front of the TV.”. 

● Sleep matters more here, not less. Recovery happens during sleep, and when you're sick your recovery demands are higher. Stick to your sleep routine even if your training routine is on pause. This is not the week to be staying up till 2am doom scrolling because "well I'm not training anyway."

The bottom line

Sick and mildly snotty? Light movement is probably fine if you feel up for it. Genuinely unwell, fever, chest stuff, body aches? Rest, actually rest, and eat and sleep like recovery is your full time job for a few days. When you come back, ease in gradually, don't just resume where you left off. Your body's still finishing the job even after you feel "fine."

Your PRs will still be there in two weeks. Your immune system fighting a losing battle because you insisted on squatting through a fever will not do you any favours.

Got questions about adjusting your training program around illness, travel, or just a rough patch? That's literally what we're here for. Drop us a message for your free trial session and we'll help you figure out the right call for your situation.

PS: If you come into the gym sick and sneeze in my face, I will kill you.

Author: Henson Irving, PIT Director