It fizzes, so it must be cleaning? Not really. Vinegar is an acid and baking soda is a base: when they meet, they neutralize each other. The reaction makes carbon dioxide, hence the bubbles, plus water and sodium acetate, a salt with little cleaning power. Each is useful on its own: vinegar dissolves limescale, baking soda works as a gentle abrasive. Use them separately, rinsing in between.
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.