This 20-Rep Armday Finisher Annihilates Your Triceps
To build arm size, strength, and muscle, you need to lift heavy and you need to lift hard. But the underrated key in the arm-muscle-building equation is one more idea, too: Time-under-tension. Your biceps and triceps need to squeeze and continue to squeeze throughout each rep and set, pushing blood into the muscle, and building a strong mind-muscle connection.
