pull-ups

I'm 23 years old 5 ft 11 135 lb I'm extremely small but I have a good physique I think. I can do about 20 push-ups in about 5 pull-ups which is pretty good I think for someone my age I think that sarms can help me get even stronger what sarms stack would you recommend for someone in...

What is your recommendation for improving my Pull-Ups. Right now I can do 12 and I've been stuck doing this many for the past 6 months with no improvements. A year ago I can only do about 5. How many can you guys do and how can I improve as fast as possible