Practice can mean a customary or habitual way of doing something. So "practice social distancing " is to habitually social distance.

It is just a fancy way of saying "do something" but in a regular manner. We need to social distance every day to avoid covid; we need to practice social distancing.

Synonyms - carry out, perform, observe, execute, follow, do

Practise = to exercise, to do

Practice social distancing just means to ensure that you social distance and continue doing it..