Choose an Ability Score that you are proficient in the saving throws of. You are able to push yourself beyond your average capabilities using a strict training procedure catered to the chosen Ability Score. As long as you use your light activity during a short rest to train in your skill at least once a day, you may add a +1 bonus to ability checks and saving throws using your chosen Ability Score every time you roll a 1 or a 20 on the same kind of checks. Using this feat you may increase your bonus by an amount equal to your proficiency bonus. If you miss one day of training your accumulated bonus suffers a -1, and suffering a -2 on the second missed day etc.
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