Check out Women's Health's FitGIF Friday every week for fun and challenging new moves to make your sweat sesh really count. Here's this week's exercise: Seated upright chest fly: If you're looking to ...

What it's supposed to do: Train chest and shoulders. What it actually does: It can put the shoulder in an unstable position and place excessive stress on the shoulder joint and its connective tissue.

Chest day workouts generally fall into one of two camps. The first (and most prevalent) is pressing exercises, like the all-important bench press and push-up, since your chest is responsible for ...