I would like to ask the professional fitness, how long each time, how long, if you have a certain physical foundation and perseverance, you can not go to the health room?

Exercise for about 30 to 50 minutes each time. Too long and too short will not have a good effect. Might as well go to the gym every day. Doing push-ups and sit-ups every day and running for about half an hour at night will be effective. Although I don't go to the gym often, I keep running every night, and now I basically have abdominal muscles (but my diet should be controlled)