Let us first define that what a workout plan is? Workout plan means that you know every day that which exercises you need to be doing on a particular day. It also explains that how much weight you would be carrying and what should be the frequency of exercises. Getting big muscles demand that you bring perfection in your bodybuilding routines and having a workout plan is exactly for it.
It is a natural tendency among the bodybuilders to try lifting more what they can actually do. The trend is much more in beginners who try to lift heavy weights in the gym just by seeing their colleagues lifting heavy. Doing so, they forget that other guys are experienced and they have taken much time to reach that level of lifting heavy. A workout plan comes here to give you a direction and make sure that you do not do what is beyond your ability and capacity. In other words, a workout plan is a guard against various sorts of injuries which you may catch otherwise. Secondly, a workout plan is important to keep you focused. You know each day that what you need to do and how much to do. Focus is the key for success. You do not just go and start doing exercises but enter the gym with a plan and approach.
Another indirect advantage of workout plan is that it caters to the need of body rest. You know which exercises to be done for particular muscles each day and what time and rest to be given to the body. It automatically prevents you from over-training your body muscles.
Question arises, how to get a good workout plan? I would say that your gym instructor or trainer could be the best choice. He is the one who is available all the time in the gym, knows your body structure and weather conditions around and is well experienced. So you should consult your trainer to help you in making a good workout plan and then get a diet plan in accordance with the workout plan that you get. This perhaps is another advantage of having workout plan that you know which exercise you need to be doing every day and which diet could be best for your body in accordance with the exercise. So do follow a workout plan to get better bodybuilding results.