I'm 6 stone 5 lbs, (roughly 60kgs) I suffered an eating disorder in my early teens, I'm now 20 & ttc my weight is a huge factor in why I can't get pregnant. I have not been able to gaining weight since those days, this is the heaviest I have been since I was around 14..

If I started protein shakes, how would I use them? What type of fitness should I try out? Any tips on gaining weight?