Bowflex’s SelecTech dumbbells are like a full rack of weights with a footprint that can fit in any apartment, and thousands of our readers have replaced or augmented their gym membership with a set, even at over $200 per pair.

These dumbbells can adjust from five to 52.5 pounds on the fly in increments as small as 2.5 pounds, allowing you to switch between multiple exercises in seconds, and up the difficulty as you get stronger.