Weight training is the most common form of strength training (sometimes called resistance training). Strength training is any physical exercise that involves contracting your muscles against resistance with the aim of muscular development. It is any physical movement in which you use your body weight or equipment (e.g., dumbbells and resistance bands) to build muscle mass, strength, and endurance. Dr. Tom is an award-winning bodybuilder and trainer to give you the best balance for your imbalanced body.