probably just genetics to be honest . I was born with a very small frame and skiny. I trained like mad for 6 year to acquire the shape you see in the before picture and this is the only picture i took lolllll ( i was 128 lbs before gym). I had similar waist pre-hrt but yes i am waist training since 3 week
Chest measurement was 42 inch and went down to 35 inch(including breast tissue) . Waist went down from 32 inch to 27.5 inch. Arm went down from 17.5 inch to 13 inch