We all have a bunch of dumbbells that we used for strength training. They can take some space though. The Merax Deluxe 55lbs Adjustable Dumbbell saves you space by replacing multiple weights. Its weight can be adjusted from 15 to 55lbs in 10lbs increments. It has a non-slip grip for comfortable workouts.
This set measures 19 x 8 x 7″, so you can use it in small rooms.