Dip Variation

I use two variations for parallel bar dips: triceps and chest. The triceps version is done with your legs behind you and folded, and using a full range of motion going from top position to below parallel. Chest dips are the same but with your legs in front of you and your chin pointed down along with your chest slightly rotated forward. That puts your weight directly on your chest whereas legs behind with chin straight ahead, the weight is on the triceps.

Either way works the shoulders as well. If you want to incorporate your abs and serratus muscles, you can hump your back up in the up position, and even crunch your lower body upward. To get full range of motion on either dip variation, you must sink very low. It's fine to lower into the position of parallel with forearm and upper-arm, making a 90 degree angle in the first set or two, but each rep afterwards should be lower. Otherwise you won't be hitting all of the muscles.