The critical thing to remember in Warrior pose is that the hips face forward. Your hips should be roughly parallel with the front of your mat. This may require you to take a wider stance.
Start in easy pose and place your left hand on the floor or your lap with your elbow slightly bent. Reach your right arm up and overhead and lean to the left side. Hold the pose for 30 seconds to 1 minute, switch sides, and repeat.
Stand with your feet hip widths apart the shift your weight onto your right foot. Raise your left leg and gently turn your knee outwards. Place your left foot at the inside of your right calf or above your knee, never on the knee.
Beginners often lean too far forward in this posture, making it more like a plank. Instead, remember to keep your weight mostly in your legs and reach your hips high, with your heels stretching toward the floor (they do not need to touch the floor). Bend your knees a little to facilitate the move if you have tight hamstrings. Keep feet parallel.
Sit on the floor, with your legs out in front of you. Cross your shins and slip each foot under the opposite knee. Rest your hands on your knees. This pose strengthens back and abdominal muscles while stretching the hips and groin.
Sitting with legs out in front of you and bend forward, keeping your back as straight as possible. Reach towards the outsides of your feet and grab them if possible. This pose stretches the hamstrings, spine, and shoulders.