why do exercise needs vary between individuals?

Answer:

There are several factors. Genetics influence body - type and metabolism, affecting exercise needs. Fitness goals vary; some aim for weight loss, others for muscle gain. Age impacts physical capabilities; younger people may tolerate more intense exercise. Health conditions like heart problems or joint issues can limit or modify exercise requirements. Lifestyle also matters; a sedentary person may need more exercise to counteract inactivity compared to someone with a physically demanding job.

Brief Explanations:

Consider genetics, goals, age, health, and lifestyle.