Leg curl/leg extension comboLeg Extension and Leg Curl Machine This is the perfect machine to target two major muscle groups, the quadriceps and hamstrings. Whats more, it also offers a quick and simple transition between these two groups. This means that the user can optimise their time in the gym without also having to switch machines between sets. This versatile piece of equipment is used for two main muscle building leg exercises, both leg extensions and hamstring curls. The