Take for example, if my character is a Barbarian, one of her saving throw proficiencies is Strength. Does this mean that if she needs to perform a "Strength Check" I can add her proficiency bonus to the Strength modifier as well? Or does the proficiency bonus ONLY apply to saving throws?
To be clear, I am not asking if a saving throw proficiency in any way translates to a skill proficiency. My question is purely about ability checks and ability saving throws only.