Virabhadrasana
This asana strengthens the muscles of the arms, shoulders, and legs, and also improves balance and enhances spine health. It helps to increase stamina and muscular endurance. It strengthens the erector spinae, and is beneficial for those with a slip disc, or lower 
back pain.

Parsvakonasana
This exercise strengthens the legs and increases the flexibility of the muscles of the shoulders, back, and adductors. It is also beneficial for those dealing with sciatica, menstrual pain, and digestion [issues]. The asana helps to improve balance.