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When you do pressing movements, such as the bench press, you also use the front part of your shoulder, the anterior deltoid. If you do a heavy shoulder workout the day after a good chest workout, you may be overworking the anterior delt. There's less problem with adding stress to your chest muscles on shoulder day. Lots of people do work chest one day and shoulders the next, and it may depend on your choice of exercises, but it would be best to structure your workouts so you don't have to do that.