A mainstay in gyms across the globe, the leg extension is perhaps one of the most controversial machines amongst the lifting community, at least from the 1990s onward. For some it is a one way ticket to an ACL tear, while for others, it’s one of the most effective means of building up the iconic tear drop quad muscle.
That the machine’s existence causes such confusion undoubtedly gives us pause for thought. Who invented this machine? And why has it proved so enduring?