7. YOU RARELY ALTER YOUR ROUTINE
Doing the exact same workout week after week will, at best, prevent new gains, and, at worst, lead to burnout. Failing to impose any new challenges on your muscles—such as by increasing the weight you use or the number of reps you perform—simply helps keep them the same size, whereas pushing yourself harder than you’re accustomed to will actually spur new muscle and strength.
8.YOU ONLY TRAIN WHAT YOU SEE IN THE MIRROR
Focusing your workouts on trophy muscles such as the pecs and biceps may be more fun, but it won’t do much for your overall development. Since 70% of your body’s total musculature is located in your legs and back, your main potential for muscle gains will remain untapped. Furthermore, this kind of trainingwill leave you with muscle imbalances that lead to injury—and that can keep you out of the gym permanently.