4 — Heavier is Better
The heavier the weight the more your muscles will have to work. If you are doing 10 curls with a dumbbell the weight should be heavy enough that even the first rep is difficult; however, use your common sense with this trick. You don’t want to injure yourself.
3 — No Pain No Gain
You build muscle by, literally, tearing the muscle fibers so they grow back bigger and stronger. The more you hurt after your exercise the more muscle growth you’ll notice. The only way to accomplish this is to catch your muscles off guard, so to speak.
2 — Stop the Cardio
Cardio exercise is specifically for calorie burning. If your goal is to build muscle you’ll need those calories to do it. If you want to incorporate cardio into your routine just remember to keep it light.