First, if you are 16 years old, you can start to practice with your bare hands, that is, exercise your body muscles with your own weight. For example, push-ups, pull-ups, lunges and sit-ups cover basic training movements and parts. One movement can have multiple changes, and different changes have different exercise effects. For example, the search "16544" uses self-respect and will not affect physical development. But if you want to practice bodybuilding, it's different!

Second, the concepts of bodybuilding and fitness are different. Please refer to "Mr. Olympic" for the ultimate purpose and effect of bodybuilding training, and the famous representative is "the future warrior governor of California"; Fitness can be regarded as daily exercise, and the ultimate goal and effect are only for people. You can exercise yourself into a model figure, or enhance some muscle strength. So, first determine your training purpose.

If you want to keep in shape, exercise for a period of time as mentioned in the first article, and then go to the gym when your body is almost developed. If you have enough budget, I suggest you hire a reliable personal trainer (the one with a learned body). In a year or so, you will have a body that the other 95% people envy. If you want to practice bodybuilding, I suggest you consult a professional training institution. Most bodybuilders don't have American time to answer your questions here.