Doing sit-ups is simple and effective to practice abdominal muscles. You can also lie flat on the bed and touch your toes with both hands (lift your body). Do it slowly. If it is fast, there will be inertia, which will affect the effect. Be sure to do it to the end and do it in place. Or you can grab the horizontal bar with both hands and hang your body (or you can put your forearm flat on the parallel bars, your arm upright and your body hanging), then lift your legs horizontally and repeat.
The biceps brachii is mainly pulled, 1. You can bend and stretch the dumbbell with the big arm, but don't put it last when stretching, so that the biceps are always stressed. Also, you can use Schwarzenegger's method, which has a nice name of 2 1 salute, that is, when you bend over and stretch the dumbbell arm, because it is 65438 from straight to bent. 2. Shoulders do pull-ups.
Triceps brachii is the main push, 1, push-ups; 2, bench press, 3, do arm flexion and extension on the parallel bars; 4. The one-arm dumbbell arm behind the neck bends and stretches. When doing the above exercises, you can practice your forearm and increase your grip strength when lifting dumbbells.
Each group does the limit. Remember not to do it every day, but every other day. Every time you do anaerobic exercise, you should destroy your muscle tissue as much as possible, and then use enough time and nutrition to repair the damaged muscle tissue and let it grow. To put it bluntly, muscles grow out at rest after anaerobic exercise.
You also need to lose abdominal fat through aerobic exercise (such as jogging). If you just do sit-ups, the fat layer will not decrease, the muscle layer will thicken, the waist will thicken, and the muscle surface will be covered with fat, which will be ugly on the surface.
Only scientific fitness can have perfect muscles.