Push-ups and chin-ups increase your relative strength. Relative strength is what determines your ability to move your body through space. It’s your strength compared to your size.
While most training programs build absolute strength through the classic barbell lifts, they often pay little attention to increasing relative strength. No matter your goals, push-ups and chin-ups should be a staple in your program. Your arms will grow, your back will blow up, your pecs will pop, and you’ll have forearms like Popeye.