The NHS recommends at least two portions of fish a week, including one oily fish such as salmon, sardines or mackerel. Oily fish provide long-chain omega-3 fats that are good for your heart and that your body makes very poorly on its own. Tinned fish counts too. A can of sardines is already a solid portion.
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.