It’s very important to do a warm up (stretching is a very good warmup). The workout should be 2 minutes long or more. The best ending exercise should be a cooling off one, eg. Om or lying down on the floor.
There is no specific rule but, when you do the morning workout before breakfast then you call that fasted. If you do that a few times you also lose weight. But, when you do it after breakfast it’s better, and you have more energy.
At least an hour of exercise a day. If you do too much it can get dangerous. Sport can open a lot of opportunities in the future. Too much sport is unhealthy. A good balanced lifestyle includes: a healthy diet and enough exercise. Always be hydrated while exercising. It's good to think about what will happen in the warm up and sometimes visualization is good before a sports game.
It’s true the highest heart rate should be in the middle. Towards the end your heart rate should go down slowly. Training and putting in a lot of time and effort. People prefer to pai, to watch men play sports more than women play sports. Always enjoy doing the sport you do.
It’s important to have a good relationship with your teammates. When you train too much you can get hurt. The best way to exercise is doing it outside because then you get fresh air and exercise.