The Body Ring's positive effects include improving its user's ability to bear heavier weapons without suffering from Attack Speed penalties, alongside their readiness in Rescuing other units. Conversely, the user's increased Constitution makes the unit harder to rescue, even by mounted units.
Beginning from Path of Radiance, the Body Ring has been replaced by the Statue Frag (石像の欠片 Sekizō no kakera, lit. Stone Figure Fragment), an item that also permanently raises its user's Constitution.
The Body Ring can be seen as an additional Speedwing that has the added limitation of only being worthwhile on units with Constitution issues. It is most useful on Pegasus Knights and female magic users, though a few units with average constitution can put it to good use as well. However, it is worth noting that mounted units actually loseAid upon receiving a boost to their constitution. Mounted units under the effects of the ring might lose the ability to Rescue units with exceedingly high constitution stats, so players might want to weigh their options before giving it to a rider.