As three-year-old is a period of sports development, three-year-old boys have stronger ability to imitate and judge sports, so parents can let their children start running, jumping, kicking and throwing at this time to exercise the muscles of arms, shoulders, elbows and legs. Of course, it also depends on the children's own situation, so that children can try some simple martial arts sports, such as squats.
If you like color, you can let him learn to draw. If your child is active and loves to show, he can learn to show. This kind of parents' practices and ideas are not unreasonable. Only children like them can achieve something, so their wishes should be respected.