If Hatha seems unchallenging or boring to you, you haven't been introduced to the practice of bandhas. The bandhas add depth and a sense of the profound to a Hatha practice. Bandhas are a way to absorb prana and bind it in to the body. Each Asana, coupled with certain bandhas, then becomes a unique receptacle for absorbing prana.
Best to learn more about the bandhas after one has been properly introduced to Hatha Yoga and has been practicing for a while. Reasons are to avoid internal injury and overcomplication. Different teachers from different styles view them somewhat differently, i.e. use them right from the start; name them differently from other styles; don't incorporate them at all. The bandhas must be learned from a proper teacher to make sure the student is not making any mistakes.