If the knee is not good, I suggest not to do sports that are easy to sprain. It is best not to do running, squatting, Tai Chi and other sports. If you exercise your legs, you can walk slowly (but be careful not to exercise for more than an hour). Besides these, there are better ways to swim. Swimming can not only exercise the muscles of the whole body, but also exert no pressure on the joints and cause no damage to the joints. Besides, swimming can also shape the body, which is also very helpful for us to shape a perfect figure.

Fitness is actually to reduce the amount of fat in the body and increase the amount of muscle. If you are a little thin, I suggest you buy some protein powder and drink it every day. Protein powder can promote muscle growth and make you gain weight properly. For people who are slightly fatter, it is recommended not to eat muscle-building things such as protein powder, because people who are fatter usually have too much nutrition, and eating muscle-building things will increase the difficulty of fitness. If it is not done well, it will be counterproductive, which will not only make the body deformed and fat, but also make the joints of the legs wear faster because of excessive pressure, which will lead to the aggravation of joint diseases.

People with poor knees can't do normal leg movements, such as squats and leapfrog. They should choose some other exercises to strengthen their muscles. For example, pull-ups, chest pushes, push-ups, sit-ups and other upper limb movements. Also, when walking, try to walk with the forefoot, which can exercise the muscles of thighs and legs and reduce the pressure on joints. If possible, you can also buy some fitness equipment, such as hand grips, dumbbells, horizontal bars, parallel bars, etc., which is of great help to fitness. You can practice by yourself when you have time. You don't have to go to the gym every time.