Great question! There are a couple important reasons. The biggest most important is that the order you do things matters. Going through a program that stacks skills and strength on top of each other is much more effective and complicated than just watching media posts. It's kinda like the difference between learning one word in a different language and learning how to speak sentences. The words are great and important, but they aren't that useful without being able to speak sentences.
The other reason is the (optional) wearable that gives real-time feedback. I encourage you to look at getting one. It's a game changer for any virtual learning.