Final answer:
Gina's body-weight resistance exercises primarily improve her muscular strength and endurance. Resistance exercises lead to hypertrophy and enhance the use of fast glycolytic fibers in muscles, beneficial for short, powerful movements and sustained muscle contractions.
Step-by-step explanation:
Gina, who performs body-weight resistance exercises three times a week, is most likely improving her muscular strength and endurance. Resistance exercises are designed to increase the size and strength of muscle fibers, leading to hypertrophy, or the enlargement of muscles. This type of exercise requires the use of fast glycolytic (FG) fibers, which are responsible for short, powerful movements and are central to activities that demand bursts of strength.
Muscular strength is the ability for a muscle to exert force during a contraction, and it's an essential component of health-related fitness that resistance exercises like the ones Gina is doing can significantly improve. Muscular endurance is the ability of a muscle to sustain repeated contractions over time without fatigue, which is also enhanced through regular resistance training.
By engaging in regular resistance exercises, Gina is not only promoting muscle growth through structural protein addition but also impacting her overall health positively by increasing her muscular fitness, which further supports cardiovascular health and may aid in weight maintenance.