The human body has the amazing ability to adapt when facing a challenge. Strength training explores this property by placing the skeletal muscles[1] under controlled stress (resistance) in order to improve muscular strength and/or endurance. When a muscle or muscle group is overloaded, each muscle fiber sends a message to our central manager, the brain, asking for help. The brain acts by recruiting more muscle fibers, contributing to most of the strength gains during the first weeks of training. But with continued practice, the muscle fibers also increase in size, which will enable you to gradually lift heavier loads. That’s the so-called muscle hypertrophy so praised by bodybuilders.
Hey, calm down! You are not going to get bulky. Even though some women are able to increase muscle mass significantly (as you can see on bodybuilding contests), that is not the rule for most of us, so there is no need to be afraid of the weight room. The magnitude of changes is closely related to the type and intensity of training, testosterone levels and genetic factors.
