Answer:Please provide me with more context! I need information about John and his situation to understand why he might have chosen PEMF therapy. For example, tell me: - What health issues does John have?- What are his goals for using PEMF therapy?- What other treatments has he tried?- What information did he receive about PEMF therapy? Once I have more details, I can give you a more informed answer about why John might have decided to try PEMF therapy.