Exercise is, by definition, physical activity that is performed for the purpose of improving one’s health, performance, and/or physical appearance. It requires specificity and—especially—overload. Therefore, I would call into question the suggestion that one could “exercise” without sweating.
I developed an wrestler’s distorted perception of sweating. One need not be able wring out the t-shirt to call it a “good workout”, but there should be some sweating/perspiration. Thus, expecting to “exercise” before, during, or after work—in street clothes—is not going to produce any significant improvement in health, performance, and/or physical appearance, albeit a healthy habit. It may be physical activity, but it can’t be considered “exercise”.
To have significant improvements in health and performance, one has to do some work—hard work, though not necessarily strenuous. Exercise is not “fun”. You should have to shower after exercise. (At least change and put on some deodorant.)
By all means, increase your regular physical activity. To improve fitness, though, step it up and make some sweat*.
Be your best today; be better tomorrow.
Carpe momento!
*Note: sweat is not the only indicator of intensity. Monitor heart rate and/or perceived exertion. Don’t sweat unnecessarily (FYI, sauna suits do not increase fat loss and sweat is not an indicator of calories burned) and keep hydrated.