Extended Side Angle or Utthita Parsvakonasana is an invigorating pose that strengthens the legs, abdominals and arms. This posture also creates stability and stretches the hips and groins.
Twisted Side-Angle or Parivrtta Parsvakonasana stretches the groins, spine, chest and shoulders. It's wonderful for digestion and balance. It also strengthens the legs and shoulders.
Prasarita Padottonasana A B C and D is also know as the wide-legged forward bend. It provides stretching for the back, hips, groins and hamstrings. Variations B & C also stretch the shoulders.
Parsvottanasana is sometimes called pyramid pose. It stretches the shoulders and hamstrings. It's also helpful to build balance and to calm the mind. If your shoulders or wrists are tight, please practice the modification of holding your opposite elbows.