A quick rinse won't cut it: to dislodge germs, you need to scrub with soap for at least 20 seconds, about the time it takes to hum 'Happy Birthday' twice, says the US CDC. The WHO even describes a full routine lasting 40 to 60 seconds, rinsing included. Don't forget the easily neglected spots: thumbs, fingertips and the gaps between your fingers. Drying your hands properly is part of the job 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.