Androgenic to anabolic ratio. A woman would want to use an aas that is more anabolic than androgenic. Tren is the opposite. In layman's terms tren is 3x as manly as test and 3x more likely to bind to the receptor.
Can I ask you this... Women respond amazingly to lower doses of less powerful aas. Why tren?
I'm gonna go out on a limb here and say he knows (coach) the results she will get from it and he can say "look what a good coach I am with the results you are getting".
Or maybe he just figures if she is that serious and wants to compete, she should just go ahead and take the plunge.
If the second one is true, he's not looking far enough ahead into her future. With a total of three years training and a one year break in there after two years, there's always the chance that a year or two from now she won't be doing it.
I'm not trying to say she's not going to do it and talk bad but that's just how it goes in this sport, you never know.
The sides from Tren for females are not reversible.
Not a good choice so early on IMO.
HDH