Antonyms for the term "professional activity studies" can be exemplified as "amateur hobbies", "leisure interests", "non-career pursuits", "casual pastimes", "informal pastimes", "avocations", "recreational interests", "leisure pursuits" and "hobbies". These antonyms represent activities or interests that are pursued purely for personal pleasure, rather than for any professional or career-related purposes. Unlike professional activity studies, these antonyms do not involve any specific or structured training, and are not necessarily related to one's professional goals or ambitions. Rather, they are undertaken simply for the sake of enjoyment and relaxation, and may include activities such as reading, gardening, playing sports or musical instruments, writing, and painting.