The leg extension is a strength training exercise primarily targeting the quadriceps muscles located at the front of the thigh. It is typically performed using a leg extension machine, where the individual sits with their back against a padded support and extends their legs against resistance. This movement helps to build muscle strength and improve knee stability. To perform the leg extension, the user adjusts the machine to fit their body size, places their ankles behind a padded bar, and then lifts the bar by straightening their legs. This exercise is commonly included in lower body workout routines and is beneficial for athletes and fitness enthusiasts alike.