Dumbbells Small weights more reps Large weights less reps

Smaller weights and more reps if you are practicing endurance; larger weights and fewer reps if you are building muscle.

Bodybuilding theory uses RM to denote the highest number of repetitions that can be done continuously for a given load. For example, the practitioner of a weight can only be lifted 5 times in a row, the weight is 5RM. if your dumbbell fitness purpose is to build muscle, then every day to do the relevant dumbbell action 8RM to 12RM, each action to do 3 to 8 groups, each group to do 8 to 12; if your dumbbell fitness purpose is to shape the body, then every day to do the relevant dumbbell action 15RM to 20RM, each action to do 5-6 groups, each group to do 15 to 20. Do 15 to 20.