Christian Dalsgaard, an associate professor at Aarhus University, discusses balancing synchronous and asynchronous activities in online teaching. He recommends engaging students through assignments, organizing them into groups, and involving peer-to-peer work. Synchronous activities like short video conferences work well for discussions and feedback, while asynchronous activities such as written assignments and discussions allow more flexibility. The key is distributing activities throughout the week in a balanced combination of synchronous and asynchronous formats.