The lead up to summer is all about toning and getting more definition for a lot of people. While I definitely enjoy a more cut physique during swimsuit season, definition isn’t just about looks. The moves and exercises for maintaining muscle definition are also great for fat burning, lean muscle building, as well as over all body shape. That’s why this workout from trainer Natalie Jill is such an awesome one. Yes, it will help you on your way to a toned set of arms for the summer, but more importantly, it will help you shed unwanted weight in those areas and sculpt a healthy, lean set of bis and tris!