I'm a skinny fat tool. However I like these at the end of back workouts. They make the rib cage/serratus sore for days when done slow, high-reps with a 45-pound grip plate in the hand. I know they're supposed to work the obliques, but I'm not trying to win any Bbing shows, just get bigger, so a slightly bigger waist doesn't bother me. Does it help on bigger movements like squat and DL? I dunno.