Answer:
B. Your exercise program should be moderately hard, and as you get stronger you should gradually increase it.
Step-by-step explanation:
Progressing your training program in a gradual and consistent manner is the most effective way to improve your fitness level while minimizing the risk of injury. The key to achieving long-term results is to gradually increase the intensity and duration of your workouts over time as your body adapts and becomes stronger.
Starting with an extremely difficult exercise program can lead to burnout or injury, while starting with an extremely easy program may not provide enough challenge to stimulate progress. A moderate intensity program that gradually increases in difficulty as you get stronger is the most effective way to achieve sustainable improvements in fitness