Final answer:
LIA, MIA, and HIA are classifications used to describe the intensity and impact of aerobic exercises. LIA is low-intensity, MIA is moderate-intensity, and HIA is high-intensity.
Step-by-step explanation:
LIA, MIA, and HIA stand for Low Impact Aerobic, Moderate Impact Aerobic, and High Impact Aerobic, respectively. They are fitness levels classifications used to describe the intensity and impact of aerobic exercises. LIA is characterized by low-intensity exercises that are gentle on joints and muscles, such as walking or swimming.
MIA involves moderate-intensity exercises that increase heart rate and breathing, such as jogging or cycling. HIA refers to high-intensity exercises that involve explosive movements and can place significant stress on the body, such as jumping or sprinting.