“To be in Yoga” is a state-of-mind, not a practice. Being in Yoga means being linked to yourself and to the world as it is.
Hatha Yoga offers you to find again this link with yourself and the world through breathing exercises (pranayama) and poses (asana), i.e. through your body.
Hatha Yoga will make your body stronger and more flexible. It will increase your breathing capacity, calm your mind, improve your concentration and help you to let go.