Do a good job in group work. In order to exercise muscles, all groups should do what they can, and the bigger the stimulus, the better. For example, you can do 50 for 5 kg, and only 20 for 10 kg. It must be that the effect of 10 kg is better than that of 5 kg, just like practicing squats. Squats with small weight are easier many times, but the effect is not as good as those with large weight and large squat.