The working rule is the old clinical shorthand: symptoms above the neck only — sniffles, mild sore throat, congestion — permit easy training if you feel up to it; anything below the neck — chest congestion, body aches, fever — means rest, full stop. Fever especially: training febrile is the one clearly bad idea in this whole topic.
And at a shared studio the medical question travels with a courtesy question, whose answer is simpler: contagious people train at home or not at all, whatever the neck rule permits.
The neck rule, and what easy means
Above-the-neck days are for genuinely light work — a walk, easy incline time, mobility — at intensities that leave conversation intact; movement at that dose often makes people feel modestly better and costs the immune system little. What above-the-neck days are not for is testing the rule: hard intervals and heavy lifting are recovery withdrawals, and an immune response is already spending the account. Below the neck or feverish, the ledger is unambiguous — rest is the training. Skipping three days costs essentially nothing, as the detraining timeline makes clear; training through the wrong illness can cost weeks.
The courtesy layer: eight people share this room
A capped studio is a small shared space, and the etiquette is the same as any workplace that learned the recent decade's lessons: contagious symptoms stay home, whatever your energy says. Cancelling late for illness is always the right call over attending sick — seats matter less than the room's health, and the cancellation answer covers the mechanics. The home alternative on mild days exists precisely for this: the easy end of the workouts library keeps a streak's thread without exporting a virus.
Coming back, on the body's schedule
Return graded, not triumphant: first session back at half the usual demand, and let it feel easy — a cold's tail (fatigue, lingering congestion) often outlasts its symptoms by days. Post-fever returns wait until at least a full fever-free day, then start gentler still. The tell that you returned too fast is unmistakable: a session that flattens you for the afternoon. Expect roughly a week from first symptom to full training for an ordinary cold, and mention anything lingering to your coach — post-illness fatigue is a common impostor in stalled-progress stories.
Common questions
Will exercise sweat out a cold?
No — that folklore confuses feeling temporarily better with recovering faster. Easy movement is fine on mild days; nothing about exertion accelerates a virus's exit.
How long after a fever until hard training?
At least a fever-free day before anything, and several graded days before genuinely hard work. Fevers are the symptom that has earned the most caution, including for hearts.
I always get sick when I start training — connected?
Sometimes: new training load plus poor sleep is an immune tax, especially in over-ambitious first months. The fix is dose, not abandonment — which is what coached ramping is for.
