If you have a stiff shoulder or tight chest muscles, you will likely have limited range of motion. (all-about-arm-exercises.com)
Keep in mind that if you are petite, the straps of some brands might slide off of your shoulders, no matter how tight the chest strap is. (mommystroller.com)
Stretches the Chest: Several complain about tight chest along with tight shoulders. (rishikulyogshala.org)