A fan doesn't lower the air temperature by a single degree: its motor actually adds a little heat. It brings relief by speeding up the evaporation of sweat and heat exchange at the surface of your skin. So leaving a fan running in an empty room achieves nothing. And in extreme heat, the WHO warns it may no longer be enough to prevent heat-related illness: better to wet your skin and find a cooler place.
Chlorine on its own is fairly gentle. But when it combines with urine, sweat and other grime from swimmers, it forms chloramines, which cause stinging eyes and that classic 'chlorine smell'. A well-kept pool barely smells at all. Shower before you swim and never pee in the water.
Muscle mass slowly shrinks with age, putting independence at risk. But in 1990, a study had nursing home residents aged 86 to 96 train their legs for eight weeks: their strength more than doubled. Muscle responds to training at any age. Getting up from a chair without using your hands is already an exercise.