In order to exercise the arm muscles, we mainly exercise the biceps brachii and triceps brachii. Here are some ways to exercise these two parts: 1. Biceps brachii 1. Alternate bending: mainly practice biceps brachii and separate biceps brachii. Action: Sit (or stand), hang dumbbells at your sides with your hands, palms facing each other, elbows at your sides. With the elbow joint as the fulcrum, bend upward, at the same time, palm up, forearm rotate outward, lift to the highest point to tighten biceps brachii, pause for a moment, and then control the reduction. Do it in turn. 2. Alternate bending: mainly practice biceps muscle peak. Action: Stand, the upper body naturally bends forward, dumbbells are hung in front of the body, and the upper arm rests on the knee or leg on the same side. The other hand is bent on the same knee or leg to stabilize the body. The arm holding the dumbbell bends upward to the highest point, so that the biceps brachii contracts to the limit, stops for a while, and then slowly recovers. 3. Lateral bending: mainly practice the brachialis and forearm muscles. Action: Sit (or stand), hang dumbbells on the side with both hands, palms facing each other, upper arm close to the side, elbow joint as the fulcrum, bend upward to the highest point, pause for a moment, and then slowly recover. Tip: You can do both arms at the same time or alternately. Second, triceps brachii 1. Neck flexion and extension: mainly practice triceps brachii. Action: Sit (or stand), hold one end of dumbbell behind the neck with both hands, palm forward, upper arm fixed, and bend and stretch with elbow as fulcrum. Tip: You can do both arms at the same time or alternately. 2. Bend over and stretch your arms: mainly practice the upper part of triceps brachii. Action: Bend over, lunge forward and backward with your feet, hold your front legs and knees with one hand to stabilize your body, and raise dumbbells with your upper arms close to your body. The triceps brachii forcibly extends the arm backward and upward until the forearm is parallel to the ground, so that the triceps brachii contracts to the limit, pauses for a while, and then slowly recovers. Moreover, protein should be supplemented after exercise to fully recover the injured muscle fibers. Let's compare five kinds of exercises to exercise waist strength. 1. boarding in the air: lie on your back on the floor with your lower back close to the ground. Put your hands on your head and open your arms. Lift your legs and climb on the bike slowly. Exhale, lift your upper body, touch your left knee with your right elbow, hold your posture for 2 seconds, and then restore. Touch the right knee with the left elbow again, hold it for 2 seconds, and then slowly return to the starting position. 2. Abdominal roll of fitness ball: lie flat on the fitness ball, with your feet flat on the ground, your hands on your head and your arms open. Reduce the chin to the chest, exhale, contract the abdominal muscles, raise the upper body about 45 degrees, hold it for 2 seconds, and then slowly return to the starting position. In order to keep balance, your feet can be separated more. If it is difficult, you can do it with your feet together. 3. Lift your legs and abdomen: lie on your back on the floor with your lower back close to the ground. Put your hands on your head and open your arms. Raise your legs at 90 degrees to your upper body, cross your legs, and bend your knees slightly. Exhale, contract the abdominal muscles, lift the upper body, keep the lower back off the ground for 2 seconds, and then slowly return to the starting position. Keep your chin down to your chest. 4. Reverse belly roll: Lie on your back on the floor with your lower back close to the ground, put your hands on your sides, raise your legs at 90 degrees to your upper body, cross your legs and bend your knees slightly. Tighten your abdominal muscles, then exhale, lift your hips slightly, lift your back slightly off the ground for 2 seconds, and then slowly return to the starting position. 5. Traditional belly roll: lying on the floor on your back, with your lower back close to the ground. Put your hands on your head and open your arms. Put your legs flat on the ground and bend your knees. The chin shrinks to the chest, contracts the abdominal muscles, exhales, lifts the upper body, keeps the lower back off the ground for 2 seconds, and then slowly returns to the starting position. Through electromyography test, it is found that boarding in the air is the most effective exercise to exercise rectus abdominis. The second place is leg lifting and belly rolling, and the third place is fitness ball belly rolling. Research shows that when a kind of training needs the continuous stability of abdominal muscles and the rotation of the body, abdominal muscles can produce the maximum activity. Because the balance needs to be controlled in an unstable environment, when doing belly roll training, the body-building ball belly roll needs more muscle contraction and control than the traditional belly roll. In fact, in order to achieve the best results, it is recommended to try to do various kinds of exercises regularly, because it can exercise different muscles and is not easy to get bored. No matter which exercise method you choose, it takes time and patience to exercise and strengthen your abdominal muscles. Remember, the training goal of abdominal muscles is muscle endurance, not muscle and strength. Finally, remember to stretch your muscles after exercise.