Daylight, far brighter than indoor light, appears to slow the excessive lengthening of the eye that causes myopia. Studies show that children who spend more time outdoors are less likely to become short-sighted. Eye doctors suggest around two hours outside a day. Outdoor playtime is eye protection too.
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.