I would ask why you want to weigh 105, but to each their own.
Back to my derby nonsense:
I'm 5'2, before I started doing derby stuff 10 weeks ago I weighed 146. 10 weeks later, I weight 143, but my legs and butt are slowly developing into muscle instead of jiggle land, which is awesome. My calves are already pretty solid, my thighs are getting there, and my butt actually holds it's shape instead of being droopy. They have gone from being cottage cheese grossness to toned, and I've gone down at least one dress size, (from a 10 to an 8, sometimes a 6 if it's a style that drapes) so I don't even care about my weight at this point, I'm just going to worry about being healthy.
I do need to work on my core and my arms outside of derby as well as endurance, I still can't run a mile with my husband, and even doing it in intervals makes me cry. (How I can do 6 hours of skating minimum a week and still suffer at running a mile continues to amuse me.)
It doesn't help that I live a mile above sea level. At sea level a few weeks ago, I ran a mile without even breathing hard. So yay at diminished air.