Kate Upton does reverse sled drags with a mini-band placed just below the knees. This is a simple modification that makes a big difference and drastically increases the glute recruitment because the glutes have to work extra hard to keep the knees from caving in. Translation: these will fry your butt. Start with your butt a little lower than normal and your feet a little wider than normal and then maintain that position as your walk backwards, fighting the urge to stand up tall and/or narrow your stance. Be