The name is not an exaggeration. Side leg raises target the outer hip and the glute medius - the stabilizing muscle that keeps the body balanced every time it stands on one leg. Wide squats drop into a wider stance and shift the load toward the inner thighs and glutes. Then it gets interesting: squat hold calf raises keep the body in a squat position while the heels rise and fall, which means the legs are already loaded when the calves have to work. Squat hold punches do the same thing with the upper body - strikes delivered from a held squat position, core braced, legs burning, arms firing anyway.

Full body works because it does not let anything off the hook. The lower body is loaded through the leg raises and squats. The calves get isolated while the legs are already fatigued. The upper body delivers punches from a position that makes everything harder. Nothing here is decorative.

The squat hold sections are where the session earns its name. Hold the position, keep the chest up, and let the whole body do what it is here to do.