Anavar is a derivative of DHT (Dihydrotestosterone) which causes it to be highly Anabolic and only mildly Androgenic, this means Anavar is good for building strength but not muscle mass, it also means Anavar is low in side effects. Steroids that are highly Androgenic such as Dianabol or Testosterone cause more side effects. This is an advantage for athletes such as powerlifters or sprinters who are looking to increase their performance without weight gain. A powerlifter who lifts in a certain weight category would want to get as strong as possible without moving up a weight class for obvious reasons.
For the female athlete we can make an exception as this can be a fairly decent bulking agent; as you recall women are more sensitive to the hormone. No, it will more than likely not put on piles of lean tissue but it can with enough calories present in the diet bring about a nice lean tissue gain. Further, as water weight is of no concern with this steroid every last pound of tissue gained will be that of 100% pure lean muscle mass. As was with cutting Anavar dosages 10mg per day will be the place to start; if the woman really wants to put on some size 20mg may prove to be fine here but she needs to have a good understanding of how her body reacts first before attempting such a dose. Further, as Anavar dosages are so low for most women, while the hormone isnt cheap, because they need so little it proves to be much more efficient on a price to benefit ratio.