First, everyone has the limits of strength. We can't train ourselves with the weight that we can't bear during training. As long as the weight can reach 80% of your tolerance range, it will be ok. The frequency of exercise does not need to be too high, but it should be kept slow. Keep the muscles tight and lasting. Only in this way can we shape muscles better. Many friends pursue fast when doing push-ups, but in fact, this effect is much better than doing it slowly.
When doing exercises, you should arrange the number of groups reasonably, which may be influenced by keep. Most people always think that 2~3 groups will do. In fact, such a group is far from reaching the amount, and it will not wake up the muscles that are sleeping on themselves. It's just a waste of your time. The number of training groups should be within 7-8 groups, and each group should be 3-4 minutes, so that the exercise will be effective.
Concentrate when you exercise, and your muscles must be in a tight state. Think of sit-ups as simple abdominal exercises. Abdominal contraction should always be in a state of tension, and then get up. But most people don't keep their abdominal muscles tense, but naturally relax. Exercise your muscles according to the above method, so as not to practice in vain.