CONVERSION KIT FOR FT2: Required with your Inspire Fitness FT2 and Inspire Fitness Bench, in order to connect the leg extension attachment to the weight stack system on the FT2 Functional Trainer. This eliminates the need for Olympic plates INTEGRATED LEG CURLS AND LEG EXTENSIONS WITH YOUR FT2: Use the Inspire Fitness Leg Curl/Extension Attachment with your FT2 to conduct weighted lower body exercises MUST HAVE INSPIRE FITNESS FT2 FUNCTIONAL TRAINER, LEG EXTENSION/ LEG CURL ATTACHMENT AND COMPATIBLE BENCH INSPIRING FITNESS AT EVERY LEVEL: Inspire Fitness has been designing and engineering home and commercial gym equipment for over 20 years