Does your dance teacher always yell at you to keep your arms in? If so, you may be missing one important muscle in your posture training, your latissimus dorsi (or lats). Your lats are a broad, triangular muscle in your back. One of the main functions of the lats are to adduct your arm (bring your arm closer to your midline). For Irish dancers, that means keeping your arms in at your side. If you have a theraband at home, try out the below exercise to begin strengthening your lats. Th