TRX is an excellent resistance training tool that uses bodyweight. It is employed by the US Military for combat conditioning.
Testimonial
The price is so affordable, for what you’re teaching. With no contracts, there’s no pressure that you’re going to be stuck with anything. The classes offer great cardio and a friendly environment, where students develop the skills to work partner drills safely through a system of signals. Rob gives each student personal attention. Every single class has something special.