Genaro P.
Maybe it's your genetics. An exercise doesn't put a bit or a lot muscle on you just by performing it. It's a multifactorial environment that makes your body increase your muscle tissues or not. Maybe you are eating to build mass instead of for maintaining what you got.
Anita U.
I do Kyra Pro dance videos on YouTube. There are longer videos and shorter videos to dance to! They are light workouts that won't make you can muscle. Good luck!