Arm Balances are generally considered energizing. Almost all arm balances are effective for building strength in the hands, arms, shoulders and core. Arm balances are typically not effective at increasing flexibility except in the sense that they tend to exhaust certain muscles in the shoulders, which can make them more flexible via PNF. Many postures in this category can be safe with certain injuries. Because they tend to involve the risk of falling, however, it is best to move slowly and take things on a case by case basis.