Episode 10 of the CF Wind Sprint series demonstrates a variety of core exercises that can be done in the gym, including including incline sit-ups, bicycles, knees-to-the-chest, ankles-to-the-bar, and hips-to-the-bar. The purpose in doing these exercises isn’t so much to get bigger as it is to strengthen and expand the ability to breathe easier. It is key to focus on your breathing when you’re doing these exercises.