Like I previously mentioned, it didn't take long for me to start noticing toned shoulders, triceps, and upper back once I started taking barre classes regularly. There's the effect of those two- and three-pound weights you'll often incorporate during your workout, sure, but nearly every exercise uses your own body weight to sculpt and tone (like in all of those dreaded planks). "Barre involves using a student's own body weight as resistance to work against while, at times, using the ballet barre to hold onto for support or to help stretch muscles," says Grove. Most barre classes focus on arms, core, legs, and glutes so you can expect a fairly well-rounded toning workout.