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2. Weight plate - Wikipedia

   en.wikipedia.org/wiki/Weight_plate

   Standard (25 mm hole) "vinyl" plates are often sold paired with dumbbells or barbells as a low-cost option for casual strength training. These plates are made of cement or sand coated with a polyvinyl chloride sheath. The cement tends to break down over time and leak out of holes in the sheath, and the weights are less dense than iron so that ...

3. 25 best dumbbell exercises for a full-body workout - AOL

   www.aol.com/10-dumbbell-exercises-tone-entire...

   When the dumbbells reach shoulder height, rotate the wrists and dumbbells so that the dumbbells face out, then lower the arms back down to your sides. Repeat 10 times. Floor press.

4. Dumbbell - Wikipedia

   en.wikipedia.org/wiki/Dumbbell

   Shown to the right is a "spinlock" dumbbell, whose ends are threaded to accept large nuts as collars. Alternatively, a dumbbell may have smooth ends with plates being secured by a sprung collar. Plate-loaded (adjustable) dumbbells (a.k.a. loadable dumbbells) Spin-lock; Spring collar clips; Compression ring collar; Ironmaster quick-lock

5. Barbell - Wikipedia

   en.wikipedia.org/wiki/Barbell

   Adjustable dumbbells are the most prominent use of "standard" weight plates (those having a 27 millimetres (1.1 in) to 31 millimetres (1.2 in) center hole). Some dumbbell sets come with an attaching bar to convert the pair to a single barbell.

6. Bench press - Wikipedia

   en.wikipedia.org/wiki/Bench_press

   In 1899, using a barbell with 48 centimetres (19 in) discs (plates), George Hackenschmidt, inventor of the barbell hack squat, rolled a barbell over his face (which was turned to the side) and performed a strict floor press with 164 kilograms (362 lb). This stood as a record for 18 years until Joe Nordquest broke it by 1 kilogram (2.2 lb) in 1916.

7. 19-inch rack - Wikipedia

   en.wikipedia.org/wiki/19-inch_rack

   The ETSI rack is defined by the European Telecommunications Standards Institute (ETS 300 119). The distance of the right edge of the right mounting rail to the left edge of the left mounting rail is 535 millimetres (21.1 in). As 535 mm is very close to 21 inches, these racks are sometimes called 21-inch racks. The gap between the posts is 500 ...