These prenatal exercises are great to help keep the thighs slim and toned. Theres no need for your legs and thighs to get bigger while you're pregnant. Try these prenatal exercises and you will keep your thighs slim and trim.... One day I'll be glad I pinned this!!\/\/ will it make my thighs go down 10 years later?? | See more about Prenatal Exercise, Thighs and Exercise.