Final answer:
The primary reason for strength gains in youth clients is increased muscle hypertrophy. During adolescence, there is an increase in testosterone levels, which causes a significant increase in muscle size.
Step-by-step explanation:
The primary reason for strength gains in youth clients is increased muscle hypertrophy. During adolescence, there is an increase in testosterone levels, which causes a significant increase in muscle size.
Physical exercise that involves weight-bearing or resistance training can further increase the size and strength of muscles. To continue experiencing strength gains, youth clients need to progressively increase the intensity of their exercises by lifting heavier weights.