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. Turn any space in your home into your own personal home gym. Included storage trays give your dumbbells a secure and elegant way to store in your home. Durable steel construction of the dumbbells provide a sleek . aesthetically-pleasing finish . perfect for your home. *iFIT experience shown. Internet and WIFI required. iFIT Membership auto-renews for $39/mo plus tax unless canceled in advance. Cancel at any time.