 When PADI instructor, Jeff Loflin, developed a sidemount diving speciality course, it proved extremely popular, and was replicated by many PADI technical-level instructors.This led to PADI offering standardised sidemount diving programs at both recreational and technical levels, making sidemount a viable and mainstream option for both recreational and technical divers.Other agencies, such as ANDI, IANTD, SSI, TDI, UTD and ISE (Innerspace Explorers) also provide sidemount training at varied levels.