Track15/20· 1:02We Build a Lot of Muscle as We Exercisefeat.Cass McCombsYour rating—Write a review →♡ FavoriteShareNot yet rated. Be the first.Home/Cass McCombs/Mr. Greg and Cass McCombs Sing and Play New Folk Songs for Children/We Build a Lot of Muscle as We ExerciseListen onSpotifyApple MusicYouTube MusicDeezerWatchWatch on YouTubeLyrics← PreviousDeciduous TreeNext →The Sounds That the Letters MakeCommunity