You can start fitness from adolescence, but you must have the right exercise method. The most suitable age for fitness is high school, that is, after 16 years old, physical development has begun to bear, so you can carry out systematic bodybuilding training or increase the weight lifting load.
Because the age is mature at this time, it will not affect the development, and the efficiency of practicing fitness at this time is also high. When the age reaches 17- 19, the muscles grow fastest, the bones tend to thicken, the shoulder blades tend to widen, and the upper body will soon become strong. In addition to becoming more horizontal, the upper body can also become taller and the bones will grow accordingly.
Laying a good foundation in adolescence and doing a little exercise in adulthood will make you stronger than others in the later stage of fitness and keep you in shape for a long time. Generally, teenagers can see obvious effects after practicing for three or four months. There is not much difference between men and women in the age at which they can start fitness. As long as there are proper exercise methods in adolescence, it will not affect development.
But there are differences between men and women in fitness, because the different hormone levels between men and women will lead to different muscles formed in fitness. Men mainly secrete male hormones, while women mainly secrete female hormones. Under normal circumstances, the ratio of the two hormones is balanced. Then the fat levels of men and women are also different, because women's natural constitution is higher than men's 10%, which is used to produce and store estrogen. And the distribution of body fat between men and women is also different. Men are best distributed on muscles, and women are best deposited on the chest and buttocks, forming a thin waist in the middle, so that they can protrude upwards and become warped downwards.