This article is from the Aerobics Fitness FAQ, by firstname.lastname@example.org (Robles) with numerous contributions by others.
(From Trevor Burton) <email@example.com>
For Aerobic Exercise in the UK, the Royal Society of Arts (RSA)
offer a "Basic Certificate in Exercise to Music". Other
organisations offer their own certificates, but there is currently
no awarding body established within education and training other
than the RSA. The industry is in the middle of re-organising and
producing National Vocational Qualifications (as have several other
industries), which will then be certified by any recognised awarding
body such as City & Guilds, BTEC and RSA. There are many regional
qualifications, for example, local authorities may run their own
courses for instructors in their areas. More advanced qualifications
than the Basic Certificate are available and many are valuable and
worthwhile. For some of these (ante- and post-natal exercise and
over-50s exercise) the YMCA is the only body (AFAIK) offering
training and certification.