Instead of a whole dumbbell rack, you just need this one tiny unit with adjustable dumbbells. A dial, pin, or plate method allows you to easily adjust the level of resistance. Thus, they are among the most space-efficient and money-efficient ways to train at home. You can utilize a single pair for just about any workout, from light warm-up moves to big compound lifts. Ideal for small footprints at home gyms where both flexibility and progressive overload is also key.