DAREBEE Workout: What it Works
Brace yourselves! Expanse works your chest and also challenges your core. Part of our Yoga Week series this focuses on strengthening your chest and upper body, giving you greater stability and confidence in how you use your body. Go for EC for even greater benefits and make sure your body is absolutely straight when in the plank position.  
Extra Credit: stay in the plank position (don't drop down to the floor) throughout the sequence.