I applied in-person. The process took 5 days. I interviewed at Everyone Active (London, England) in Aug 2018
Interview
Do the National Pool Lifeguard Qualification (NPLQ) course. This course lasts 5 days, learning from 9am-5pm everyday + outside of these hours, and the assessment on the 6th day. Job opportunities came immediately at the centre I had done the NPLQ.