The phrase "dumb bells" refers to a type of exercise equipment that are handheld weights used for strength training and muscle building. Full definition
Stand with your feet shoulder - length apart and get 8 kg (about 17 lbs) dumb bells in each hand. (fitnessandpower.com)
I prefer exercising at home and just have a set of dumb bells right now. (marksdailyapple.com)
I don't like going to a gym anymore and prefer to workout at home or outside using body weight exercises with dumb bells... perhaps a workout post on eccentric lifting at home? (marksdailyapple.com)