This form of exercise, though seemingly beneficial, has some major drawbacks that could make it less effective than other forms of exercise. For one, taking the subway to a new part of the city may be exciting and a way to explore, but it isn't necessarily the most efficient way to get a good workout. The time spent walking to a new destination and then back home can be quite lengthy, and that time can be better utilized by engaging in more strenuous activities such as running, jogging, or weightlifting.

Furthermore, the lack of structure and regulation can be a hindrance to effective exercise. When exercising, it's important to have some kind of plan so that you can track your progress and make sure you are progressing in the right direction. Without any sort of plan, it can be difficult to ensure that you are reaching your goals.

Finally, the lack of equipment or access to a gym can make this exercise form much less effective than it could be. Without access to a gym, it can be difficult to incorporate strength training or other types of exercise that require specialized equipment.

Overall, while the Boomerang may be a fun way to explore a new part of the city, it may not be the most effective form of exercise. Thus, this form of exercise may be less effective than other forms that allow for more structure, progress tracking, and access to necessary equipment.