As discussed earlier in the book, retaining insulin sensitivity is highly beneficial when you’re eating a surplus of calories to build muscle, whereas insulin resistance inhibits muscle growth and promotes fat storage. This is where cardio comes in because it improves insulin sensitivity and does so in a dose-dependent manner (meaning the more you do, the more benefits you get).22 In this way, doing cardio can help your muscles better absorb the nutrients you eat, which can mean more muscle growth and less fat storage over time.
