That aerobic platform you use at the gym? You can have one in your own home for less than you might think. This circuit sized version of The Step is down to $33 today, and the health club size is on sale for $60.

Both include four removable riser feet (and you can buy more on sale for the health club version) that adjust the height of the step, and thus, the intensity of your workouts. It’s a simple concept, but a versatile one, and these are among the most popular options you can buy.