Center the bra strap holder against the middle of your back

Pull the bra strap holder along the strap, so it is behind you, still attached to the strap. At this point it should be an inch under your left shoulder blade.

Pull your right bra strap towards the holder. Slide it through the center divider. It should fall into place against the right panel of the bra strap holder.

Center the bra strap holder against the middle of your back. Check how it feels. It should be snug, but not tight and feel comfortable.

Pull the lingeries strap holder along the strap, so it is behind you, still attached to the strap. At this point it should be an inch under your left shoulder blade.

Pull your right bra strap towards the holder. Slide it through the center divider. It should fall into place against the right panel of the bra strap holder.

Center the bra strap holder against the middle of your back. Check how it feels. It should be snug, but not tight and feel comfortable.

Shop at a store where you feel comfortable. The staff should be helpful and able to answer your questions knowledgeably. Or shop online at a merchant such as Title9Sports.com, which has a vast selection of sports bras including one that holds up to size 40DDDs, as well as a nursing sports bra.

Put the bra on. You'll have three choices: pulling it on over your head, fastening it in front, and closing it in the back. It should feel comfortable when you put it on. Large-breasted women should check that there's no pressure on the shoulders.

Inspect how the bra is built. There should be no exposed metal or hardware, which will irritate by the end of your workout. Quality bras have plush lining surrounding all metal pieces.

Jump up and down to gauge movement. Women up to an average D cup are best off with a compression bra, while full Ds need an encapsulation bra to minimize movement. Ask if you can testdrive the bra and take a run around the block.MORE:cheap sexy lingerie