A personal trainer will train the biceps AND the triceps. When they work the quadriceps, they know it is vital to work the hamstrings too. Why? Because imbalanced training leads to injuries, and personal trainers know it. After building and strengthening, personal trainers never forget to stretch, because that counterbalancing element also protects and keeps the body safe.…Original article: To Extreme Diet or Not? Part II – Weight Loss No. 33.