1) Doing planks will shrink your waistline . As the transversus abdominus gets stronger from doing planks, it will tighten your waistline all the way around in a way that crunches never could.
Do plank twists make your waist smaller?
1) Doing planks will shrink your waistline . As the transversus abdominus gets stronger from doing planks, it will tighten your waistline all the way around in a way that crunches never could.