The first time is a small weight, because you have to give the muscles an adaptation process, otherwise it will be counterproductive to suddenly come to a large weight muscle. You should do it step by step, and you mainly lose fat, not exercise strength or gain muscle. You should touch it more often and touch several groups of small weights. For example, if you can lift a small weight of 15-20 in one group now, it is endurance exercise, and you can do three groups. This will do.