Most people limit their leg workout to squats and lunges and while those are quite effective exercises, they only target the muscles in a single plane of action (sagittal). However, in order to get a fuller development of the muscle fibres, it is fundamental to work all muscle groups in different angles.
The following workout focus mostly on hip dominant exercises, putting more challenge at the posterior chain (gluteal group and hamstrings). The goal is to engage these muscle groups in different planes of action, recruiting more muscle fibres throughout the workout. The challenge comes from pairing moderate to heavy loaded exercises with more cardiovascular demanding ones. The result is a kick-ass workout which will get you the best of both worlds. Enjoy!