GET INSURANCE... i train, however i am certified by ISSA... most gyms at least corporate ones require a certification, but if you are doing your own business then i am sure it is not necessary... the certifications are easy though and not too expensive. If you want this as a career then i would just spend a weekend and some cash and get it over with... Also learn how to stretch people... i have clients that book me for stretching alone and the massage thing is a perk too... i love working with a trainer that can work me out, stretch me out and then massage my sore muscles... that is cool