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There's no way around it - getting big takes hard work! If you aren't already working out regularly, try to fit at least four workout sessions into your weekly schedule. You can do even more if you like, as long as you give yourself a chance to rest and recuperate. Your path to bigness starts on your calendar — devote plenty of time to your goal, and you'll see results.  There's no single "best" workout — what works for one person may not work for another. Many health resources recommend workouts of about 30 minutes to an hour. As long as you stay on task, this should be plenty of time — however, some people prefer longer, less intense workouts.  The workout schedule above should work for most people. However, it's far from the only workout plan out there. There are a huge variety of workout plans available for free online — all it takes is a simple search engine query to find plenty of good ones. Getting big muscles means spending lots of time doing resistance training. To many people, this basically means "lifting weights." This is a great way to put on muscle, but this isn't actually the only way to do resistance training. For example, bodyweight exercises (like pushups, lunges, and so on) and exercise bands are two other ways to build muscles. Regardless of the exact exercise routine you use, a strong focus on challenging resistance training should lead to muscle growth. Traditional weightlifting wisdom is that performing high weight, low rep exercises tend to increase muscle size, while performing low weight, high rep exercises tend to increase muscle tone. However, recent research seems to suggest that as long as you work to the point of fatigue, you should build muscle with either strategy. Cardio training — activities like running, cycling, jogging, swimming, elliptical training, and so on — isn't bad for you. In fact, it's great for you and is known to have many physical and mental health benefits. However, when you're trying to build muscle, putting a heavy focus on cardio can sometimes be like shooting yourself in the foot. Cardio exercise takes lots of time and energy and won't necessarily give you the sorts of big, bulky muscles you're looking for, so the time you spend doing cardio can often be better spent doing resistance training. Aim to spend no more than a day or two per week on cardio training. One good way to manage the amount of cardio you do is to reserve cardio for your "off" days — that is, the days when you don't have any resistance training scheduled. This way, you don't waste any time that you would have spent building muscle on cardio. Having trouble sticking to your workout routine? Stay motivated by joining a group of people who are also dedicated to their own workouts! Becoming part of a group doesn't just give you people to talk with your struggles, joys, and victories with — it also makes it harder to slack off because your team members will hold you accountable for it!  If you can find people to work out with you in your friends or family, great! If not, consider joining an exercise class at your local gym — it's a great opportunity to meet someone! Alternatively, consider getting in touch with an exercise meetup group. These are groups of people who coordinate online to meet at gyms and exercise together. A simple search for "Fitness meetup (your city name)" should yield decent results. The time you don't spend exercising is just as important as the time you do spend exercising when it comes to building muscle. If you don't give yourself time to rest, your body won't be able to rebuild your muscles as effectively after you break them down through exercise. Remember, building big muscles takes patience, so don't overdo it — give your muscles at least one day a week without exercise. In addition, you'll want to make sure to get a full night's sleep after each exercise session. Human growth hormones (the chemicals that help you build muscle) are at their highest levels when you sleep, so neglecting to get a good night's rest after a workout is essentially robbing yourself of muscle gains.
Aim to work out 4-5 times per week. Use resistance training to build muscle. Be conservative about your cardio training. Join a workout community. Get plenty of rest.