What are some disadvantages of co-curricular activities?

The Health Research Funding organization says that co-curricular activities are a disruption to students because they add pressure, affect the time students spend with their families, and disrupt learning due to tiredness. The organization isn't saying that these activities are bad, but the lack of proper time management due to these activities leads to the problems.

One of the main advantages of co-curricular activities is that they teach students how to be responsible. Proponents argue that students will have even more pressure, time constraints, and lack of sleep in the real world, but that learning to properly manage those scenarios at a young age makes them more successful later in life.