You can't get into the gym without the right equipment, so we put the hottest sports bras to the jiggle test. Find out which ones kept everything in place and which might leave you feeling flat.

Champion Jogbra Sportshape Bra, $24.99
Why we loved it: Anything that comes with its own motion-control requirements is all right with us. Champion takes your boobs' bounce seriously by rating the level of support required to control "breast movement" and evaluating the amount of that movement involved in various activities. Depending on the specific activity you intend to use it for, and your breast size, you can find the exact right support. Mumbo jumbo aside, all you need to know is that it works. The Sportshape is a soft-cup sports bra that has adjustable straps and double back clasps. The mesh panel between the cups allows for ventilation where you need it most. All things considered, this is the best of the bunch.

What you should know: The only drawback here is aesthetic. Even though the "baseball cups" ‑- two seams cutting across the breasts horizontally like, you guessed it, a baseball ‑- are doing something right, they leave a weird silhouette when the bra is worn alone, which probably wouldn't be done at the gym anyway, since it looks more like intimate apparel than Stairmaster chic.

Natori Sport Bra #34439, $39
Why we loved it: There's no patented material and no gimmick, but holy cow, does this thing work! This comfy cotton number feels and performs like a sports bra while fitting like a regular one. A big, efficient regular one, but the covered underwire allows for a well-defined breast shape (versus tank bras' uniboob look) without any digging whatsoever. Almost everything is adjustable, so you really can customize the fit for maximum effectiveness. What you should know: The way it performed its function more than makes up for any shortcomings in form, which is really just a matter of preference anyway. To us, the double seam (an underwire and a reinforced side panel) is a little reminiscent of a nursing bra. Or chest plate. But you should also note that, like any other bra, getting the proper fit is key. Without it, the straps had a tendency to slip and the cups felt a little loose. Once you adjust the back clasps and strap length, you'll be good to go.