6 SIGNS YOU'RE TRAINING TOO LIGHT (AND Killing Your Gains) If you want to build muscle, you need to give your body a reason to grow. Here's how to tell if you're training like a warm-up, not a workout: 1. You're not even breaking a sweat If you breeze through sets without effort, you're not pushing hard enough. Muscle growth demands physical stress-and sweat is a sign your body is being challenged, especially during heavy lifts. Tip: Make your working sets count. If your hoodie's still dry by th