Poor Posture can cause aches and pains and over time lead to muscle imbalances. If you're sat at a desk all day everyday, the chances are your hamstrings and hip flexors are tight and over time shorten
Poor Digestion. Eating natural organic yogurt regularly will help restore the right balance of bacteria in the intestines and ensure that the digestive process is taking place properly. Drinking plenty of water and chewing food thoroughly whilst not rushing meals will also help!
Over Training can lead to tiredness, loss of focus, and no results. The body grows and repairs itself when it is at rest, so train don't drain! Use compound exercises that activate more muscle groups, this way the body will shed unwanted fat and elevate metabolism as well as tone the body.
Over use of aerobic activity. Gyms are almost full up with treadmills and cross trainers to the point where there is not much room for anything or anybody else. The body does need a certain level of cardiovascular to stay healthy, but excessive cardio training will cause muscle imbalances. 30 minutes 3 times a week of cardio exercise is not needed. A professional Sprinter wouldn't take that approach, and they have less body fat than the average gym goer who sticks to the treadmill and cross trainer in the gym.
Fad Dieting. Instead of reading endless books on new diets just eat right for your metabolic type. The three general types are, Carb type, Protein type, or mixed type. Depending on which one you are, for example, if you're a protein type you would emphasize your diet more around Protein and less carbohydrates.