Resistance training is the ideal type of exercise to prevent muscle loss, maintain a healthy weight, build lean muscle, age powerfully, and so much more. Here, JJ shares 4 things to focus on as you build muscle. She shows you how to design a workout routine regardless of your current fitness level, the overlooked key for lean muscle, the #1 food in your diet to build and maintain muscle, the best way to measure and monitor your progress, and how building muscle helps you age confidently. “You’re not only going to love the way it makes you look and feel now,” JJ says in this video about resistance training. “Your future self will thank you.”