The 75 Hard Challenge can help strengthen relationships by promoting habits that encourage connection, communication, and mutual support. The program's structure encourages participants to engage in daily practices that enhance their relationships, such as spending quality time together, practicing active listening, and expressing appreciation. By committing to these habits for 75 days, participants can develop deeper connections and build stronger, more fulfilling relationships. The challenge's emphasis on discipline and consistency helps individuals stay on track with their relationship-building goals. The daily reading habit can include books on relationships and communication, providing valuable insights into building and maintaining healthy relationships.