Working out at a gym. This is good option for beginners and experienced lifters. The gym has a wide variety of machines and dumbbells, so you get to see and try out all the different options. Plus, gyms have trainers, and if you're a beginner, it can be very helpful to have a trainer plan a program for you and take you through it to teach you how to lift. Most gyms have introductory sessions, and these are a good idea if you're new to lifting. Once you get the hang of it, you can explore it on your own with confidence.
Change things up. After six or more weeks of consistent strength training, which is about the amount of time it takes to start seeing improvement in your body, you can change your routine to make it more difficult. Lifting the same weights for the same exercises every week will keep your body in the same place. You can modify weights or repetitions, choose different exercises, or change the order in which you do them. You only have to make one change at a time to make a difference, although more is often better. 
"Wide-grip pull-ups coax the upper lats to come out," Arnold wrote. Understand that with wide-grip movements, the elbows stay out away from the sides, which engages the upper lats more effectively. With closer-grip and reverse-grip back exercises, the elbows stay in tighter to the sides, which reduces the emphasis on the upper lats and instead places more of the focus on the lower lats. So depending on elbow position relative to your torso, you can effectively focus on some areas of the back over others.

20. Avoid obsessing about trendy and new bodybuilding workouts. Most of them have a huge level of nonsense. Notice how almost 98% of these guides tell you nothing about adding weight? Guess what: weight addition is the key ingredient to any progress in bodybuilding. Maybe the books you’re reading won’t tell you about it because doing so will stop you to buy more of their books?

After session 12, consider whether you need to increase the weight for any particular exercise. If you can comfortably do more than the RM of 12 exercises, increase the weight by a modest amount, say two pounds or a kilogram for isolation exercise muscles such as triceps and biceps, and 5 pounds or 2.5.kilograms for compound and large muscle group exercises like squats and deadlifts. When using dumbbells, this would apply to each one. Don’t increase the number of sets beyond 3 at this time.