After doing the same type of exercise for a while, you typically hit a plateau — your body might not be working hard enough for you to continue seeing results. When it comes time to advance your fitness regime, a weighted vest may help. “It’s versatile and adds intensity to basic, functional movements,” says Joe Rodonis , a Tonal coach. “A weighted vest is a great way to increase muscle activation and the challenge of a conditioning session without having to actually carry more weight with