1. It’s Not A Real Workout Unless You’re Sweating and Sore Afterwards.
A “real” workout is the one that best serves your own interests and individual goals. Research indicates that it is progressively overloading the body in some way, whether it be in terms of pace, intensity, or volume, is what leads to tangible results. Whether or not that leaves you sore and sweaty is completely beside the point.
If you had an intense exercise session the day before, it’s better to do a lower-intensity activity with a stretch/foam-roll session to aid in muscular recovery and regeneration. This will help you see better strength and endurance gains than if you’re working to your maximal potential day after day.