In bodybuilding theory, RM is used to indicate the maximum number of repetitions that a load can do continuously. For example, an exerciser can only lift a heavy object five times in a row, so the heavy object is 5RM. If the purpose of your dumbbell fitness is to lose weight, do the relevant dumbbell movements 15RM to 20RM every day, with 5-6 groups for each movement 1520. It is better to do aerobic exercise to lose weight after finishing.