Since I am back home and I don't have to cook for myself anymore (yay) I decided to put on some weight finally.
in 3 and half months I went from 63 to 74 (163 lbs) aiming for 80 and later 85 Kg (in a year or so) height 182cm
Doing weights, pushups and crunches.
Gain in muscle mass on arms is already quite visible but with abs not much. kinda need to step up the routine and find more exercises than crunches (which i think i had been doing wrong anyway)
Need to join some yoga class for stretching also as I hate doing that so some motivation from a group is a necessity:)
If you want muscle gain from yoga I'd go for Vinyasa (with maybe some Yin mixed in, or afterwards on your own for 20-30 minutes) or Hot Yoga (aka Bikram), they seem to be the most likely to pack on muscle and you will certainly stretch the crap out of muscles you probably aren't hitting right now which will likely be a big benefit.