By Sheila Monaghan Skipping and jumping it is not — this type of rope work has a bit more heft. Though often found coiled in a corner of your exercise floor, the weighted rope has potential beyond its occasional appearance in a circuit workout. In fact, if used creatively, this understated piece of equipment can offer a stand-alone, total-body workout that’s anything but basic. Rope work is one of the most efficient ways to simultaneously boost your metabolism and tone muscle, which is precisely why we tapped one of its masters, group fitness instructor Gerren Liles, who teaches the