Many people put off starting an exercise program because they think that in order to get results they will have to devote hours upon hours every week grinding out long workouts in the gym.
Actually, the opposite is true. In order to get meaningful results from your training program, you need to work out as intensely as possible—and if you do that, your workouts will have to be brief.
Each set you perform should be a maximum effort, taken to a point where you cannot continue with proper form. This is called training to failure.
The critical, yet often ignored, fact is that workout intensity and workout duration are inversely proportional. In other words, if you work out really hard, you won’t be able to work out for a long time, whether you want to or not.
Long, low-intensity workouts are not only unnecessary, they are also counter-productive. They do not stimulate meaningful results, prevent optimum recovery, and lead to mental burnout.
Tip: For best results, your workouts should be brief and intense. Performing one set to failure per exercise, and no more than 12 exercises per workout, satisfies these requirements.