The weather is heating up, and that means sleeves are getting shorter! You don't have to lift a massive amount of weight to tone up your arms for summer. All it takes is some specific moves and a little repetition. Lindsey Mathews shares an at-home workout to get your arms tank top ready. Many people fall into some common bad habits, like using momentum. Lindsey shares how to stop those habits and make sure you're getting the most out of your exercise routine.