I exfoliate once a day, almost everyday using a chemical exfolliant. Sometimes I would skip a day because I am lazy or I forget. I would use a physical exfolliants, once or twice a week
It all depends on your skin type and also the choice of chemical or physical exfolliants because formula and percentage of the exfolliiants is different.
Some swear by BHA while for some BHA is too drying so they use AHA. AHA comes in different typea, glycolic, lactic, mendelic etc2. Exfolliants can come in different textures too! Liquid, gel, or creams. It can be leave of exfolliants or comes in a face wash.
I am definitely on team of daily exfolliants because my skin works with daily exfoliating to keep it in an optimum conditions.
Daily or frequent exfolliants gives that skin that nice glow.
For the body, I just use brush or loofah coz I am lazy but I am thinking of adding a mild exfolliants too.