Psychology has shown us that the mechanics of making a stronger relationship are similar. By sharing thoughts, feelings, or bringing up conflicts that may be outside of our comfort zone with our partners we are taking our relationship to the gym. Though the process of confronting a partner about something you have been holding in may be uncomfortable and could even tear the relationship, it also builds resiliency in the relationship which sets the stage for more intimacy and connection.
In a gym workout, you don't want to go in cold and lift the heaviest weight, this leads to injury. Similarly, in a relationship it is best to regularly check in with your partner rather than waiting until the issue is too large to handle. Over time these relationship workouts not only get easier but can be the thing you look forward to most with your partner!