main job is computer/cyber security (won't tell details but involves travelling from time to time). very sedentary lifestyle other that the country travelling. is it possible to have a second job as a divemaster/instructor or kayaking instructor or pool/beach lifesaver? (P.S. have qualifications for all 3). it will balance the sedentary lifestyle. just want to know if it's a good idea. because the 2nd job is not fixed timing and mostly weekends which I can use as my recreation. I can decide if i want to teach in that session or not. even if not the ones mentioned above, is a 2nd job usually possible?