It depends on everyone's specific situation and the purpose of the landlord's exercise. If you want to exercise your muscles, you should stimulate them with heavy objects. You can start with a little lighter, and then increase the weight until you can only do 4 or 6 such weights with all your strength. If you want to lose weight, you don't need to be too heavy, but if you want to increase the number of times, you'd better do it for half an hour to an hour and sweat all over.