For example, do four groups of push-ups, 20 in each group, and rest between each group 1 minute. One group represents the number of actions that need to be completed. 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 gain muscle, do dumbbell movements from 8RM to 12RM every day, with 3 to 8 groups of 8 to12 in each group; If the purpose of your dumbbell fitness is to keep fit, do the related dumbbell movements 15RM to 20RM every day, and do 5-6 groups for each movement, each group 1520.