The muscular system is extremely complex and each muscle relies on the other. Neglecting certain muscles while overtraining others is a recipe for muscular imbalance. For instance, having really strong thigh muscles but weak hamstrings can increase your risk for knee pain. To get the most out of your workout, consider the services of a knowledgeable professional. You and your trainer can put together a balanced plan (that won't break the bank) and decide on how often to meet to assess progress!