A dry shirt does not settle the question
You finish a few sets, look at your shirt, and wonder whether you did enough. It is an understandable shortcut: sweat is visible, progress takes longer. But the amount of sweat you notice cannot tell you whether a session built strength or improved your fitness.
Sweating helps regulate body temperature. Heat and humidity change the cooling challenge: in humid air, sweat evaporates less easily. A wetter shirt can therefore reflect different conditions, not a better workout. [1]
For strength, look at the work
ACSM’s 2026 guidance emphasizes regular resistance training, suitable effort, and a plan matched to your goal. Bodyweight exercises can be effective too. Sweat is not the target those recommendations ask you to pursue. [2]
For a practical training note, record the exercise variation, sets, repetitions, rest, and how demanding the sets felt. “Three sets of the same push-up variation, with the usual rests” tells you what you did. “Barely sweaty” does not.
Compare similar sessions over time. More repetitions with the same variation and comparable effort may be worth noticing; a different shirt or a warmer room adds little to that comparison. One easy or hard session does not establish a trend. Our suggestion is to keep enough context to interpret the work, not to give every workout a grade.
For aerobic activity, use breathing as a clue
For a brisk walk or another aerobic activity, the CDC suggests the talk test: at moderate intensity, conversation is possible but singing is difficult; at vigorous intensity, speaking requires frequent pauses for breath. It is a rough guide to relative aerobic intensity, not a test of strength gains. [3]
Do not shorten every rest between strength sets just to get out of breath. First decide what you want the session to accomplish. A walk and a strength session do not need to feel identical to be useful.
Do not chase extra heat
Adding clothes or making the room hotter to force sweat adds a cooling problem. Choose comfortable conditions for training instead. If exercise in the heat brings dizziness, weakness, or nausea, stop and move somewhere cool; seek medical help if symptoms persist. Confusion or loss of consciousness is an emergency. [1]
Next time, write down one thing you actually practiced and how it felt. That gives your next session a useful reference. You do not need a soaked shirt to keep the note.