The BowFlex home gyms offer resistance from the start to finish of each exercise. BowFlex Power Rods feel very much like free weights or dumbbells. Power Rod resistance is progressive, meaning that the more you flex the rods, the more weight you are displacing. On BowFlex Revolution home gyms resistance is linear and gives the feel of plate-loaded machines, but eliminates the bulk and weight. The BowFlex Revolution unit also has more adjustability of starting locations and incorporates about 10 inches (24.5 cm) of additional cable travel. Both technologies use resistance strength training which is what makes BowFlex home gyms so effective.