You shouldn't exercise your muscles yet, especially when you think your muscles can be very effective in ten days and a half months. I'm telling you, there's a way, just ten days and a half, but you shouldn't want to go to the hospital for plastic surgery. You don't want to be a coolie when you are so strong in the second grade. If you practice biceps, when you practice pectoral muscles, you should narrow the distance between your hands to the width of your shoulders and open your hands more than 50 cm. You should be developing now. Skipping rope. Boys 19 years old will exercise muscles. Unless you can exercise very hard before 19 years old, there will be no obvious effect.