These guys are great. I’ve been watching their YouTube videos for a while now to help with school, but this app (along with their other app) has SO MUCH more to offer. The exercises are explained articulately, clearly demonstrated, and beautifully visualized. Not only do I trust the quality of their work, I actually **enjoy** browsing these videos, which makes practicing them fun, too. Recommending this app to all my classmates, despite selfishly wanting to keep this secret tool all to myself 😅