With the ProForm Rapid Strike 50 Lb. Adjustable Dumbbell Set, each dumbbell can become five dumbbells. Quickly modify each dumbbell in 10-pound increments, from 10 to 50 pounds. Based on your fitness level, you can turn one dumbbell into a 10 pound, 20 pound, 30 pound, 40 pound, or 50 pound dumbbell. With an iFIT membership, you can use your phone, tablet, or Tv to follow expert iFIT Trainers in worldwide outdoor workouts and studio workouts. iFIT Trainers can help you master a huge variety of dumbbell exercises, like bicep curls, shoulder presses, chest presses, tricep kickbacks, dumbbell rows, and more. With the Rapid Strike 50 Lb. Adjustable Dumbbell Set, you ll be able to target nearly every muscle group, from your lower body to upper body, and you ll be able to choose the weight of your choice. You ll save plenty of space since you ll only need to buy one dumbbell set rather than 5 dumbbell sets.