When planning an effective fitness program, it's important to include a variety of components to ensure a well-rounded approach to fitness. All the options you've provided can be beneficial:
A. Body weight exercises - These are great for building strength and can be done anywhere. They often involve multiple muscle groups and can improve overall fitness.
B. Lifting weights - Weight training is important for building muscle strength and endurance, and it can help increase metabolism and bone density.
C. Walking - This is an excellent cardiovascular exercise that is low-impact and accessible. It helps improve cardiovascular health and can also aid in weight management.
D. Stretching - Incorporating flexibility training is essential for improving range of motion, preventing injuries, and aiding recovery.
In conclusion, a comprehensive fitness program should ideally include elements from all these categories: body weight exercises, weight lifting, cardiovascular activities like walking, and stretching for flexibility.