The first key is discipline. In order to get things done faster and more efficiently is to have great discipline. If someone decides to start working out but automatically thinks that he is too busy to workout then he should write down his schedule including the free time that he has in between. The best thing about working out is that it all does not have to be done at once; you can split up workouts thru out the day.
After that he should look at each amount of free time he has. If he has thirty minutes of free time in the morning before work and thirty minutes of free time after work before he goes to his other job then he should try to do cardio exercises in the morning and lift weights in the afternoon after work. Cardio exercises increases stamina and the overall health of your body. Most people do cardio workouts to stay fit or lose weight.
There are many different workout plans, some workouts can increase muscle mass and other workout plans can increase muscle tone. To increase muscle mass you have to lift weights therefore you would more than likely have to go to the gym. So if you are trying to build muscle mass then you need to make sure that you have time in your schedule to go to the gym a couple days a week. If you do not have enough time to go to the gym a few days a week then you may have to sacrifice some sleep time.
For some people they will do anything to get the body they want and if you are that type of person then sacrificing some sleep time to visit the gym for about an hour will be well worth the results to you. If sacrificing sleep time is not worth it to you then you might want to find a different method to fit your working out time into your schedule.